Summary:
Ref PHI1749. Instead of opening files to the last unchanged line on either side of the change, open files to the "simple" line number of the selected block.
For inlines, this is the inline line number.
For blocks, this is the first new-file line number, or the first old-file line number if no new-file line number exists in the block.
This may not always be what the user is hoping for (we can't know what the state of their working copy is) but should produce more obvious behavior.
Test Plan:
- In Diffusion, used "Open in Editor" with and without line selections. Saw same behavior as before.
- Used "n" and "r" to leave an inline with the keyboard, saw same behavior as before.
- Used "\" and "Open in Editor" menu item to open a file with:
- Nothing selected or changeset selected (line: 1).
- An inline selected (line: inline line).
- A block selected (line: first line in block, per above).
Differential Revision: https://secure.phabricator.com/D21282
Summary:
Ref T13513. Currently, all the inline code passes around strings to describe content. I plan to add background music, animation effects, etc., soon. To prepare for this change, make content a state object.
This does not change any user-visible behavior, it just prepares for content to become more complicated than a single string.
Test Plan: Created, edited, submitted, cancelled, etc., comments.
Maniphest Tasks: T13513
Differential Revision: https://secure.phabricator.com/D21273
Summary: Ref T13513. The code which added "r" and "R" to the inline menu accidentally discarded the difference between the keystrokes.
Test Plan:
- Clicked an inline, pressed "r", got new empty inline (previously: inline with quote).
- Clicked an inline, pressed "R", got a new quoted inline.
- Repeated steps with the menu items, got the expected behaviors.
Maniphest Tasks: T13513
Differential Revision: https://secure.phabricator.com/D21268
Summary:
Ref T13513. The on-hover-inline reticle has switched over to have cell-based behavior. Switch the on-hover-line-number reticle to use the same behavior.
Also, clean up the dirty/redraw loop slightly: we no longer need to dirty on resize, and we don't need to redraw if the range isn't actually dirty.
Test Plan: Highlighted lines and line ranges. Hovered over inlines.
Maniphest Tasks: T13513
Differential Revision: https://secure.phabricator.com/D21262
Summary:
Ref T13513. The way I'm highlighting lines won't work for Jupyter notebooks or other complex content blocks, and I don't see an obvious way to make it work that's reasonably robust.
However, we can just ignore the range behavior for complex content and treat the entire block as selected. This isn't quite as fancy as the source behavior, but pretty good.
Also, adjust unified diff behavior to work correctly with highlighting and range selection.
Test Plan:
- Used range selection in a Jupyter notebook, got reasonable behavior (range is treated as "entire block").
- Used range selection in a unified diff, got equivalent behavior to 2-up diffs.
Maniphest Tasks: T13513
Differential Revision: https://secure.phabricator.com/D21257
Summary:
Ref T13513. Give selected inlines a selection state and visual cues which are similar to the changeset selection state.
Also fix a couple of minor issues with select interactions and offset comments.
Test Plan: Selected inlines, saw obvious visual cues.
Maniphest Tasks: T13513
Differential Revision: https://secure.phabricator.com/D21256
Summary: Ref T13513. Currently, clicking inline or changeset headers eats the click events. This doesn't serve any clear purpose, and means these clicks do not clear text selections from the document, which is unusual.
Test Plan:
- Selected some text in a diff.
- Clicked a changeset header to select it.
- Before patch: text selection and context menu were retained.
- After patch: text selection was cleared and context menu was dismissed.
Maniphest Tasks: T13513
Differential Revision: https://secure.phabricator.com/D21255
Summary:
Ref T13513. Currently, when creating an inline by selecting a line range, slightly careless handling leads to an inline with "0" offsets (by passing "undefined" to the server). This causes the block to highlight every line except the last one as fully bright, which is incorrect.
An inline with "0" offsets and an inline with no offsets are different. Be more careful about passing offsets around and rendering them.
Test Plan:
- Used the line numbers to add an inline to lines 4-8 of a change.
- Hovered the inline.
- Saw all four lines marked as "dull"-highlighted (previously: three bright lines, one dull line).
Maniphest Tasks: T13513
Differential Revision: https://secure.phabricator.com/D21252
Summary:
Ref T13513. When a user selects a text range and uses "New Inline Comment" to create a comment directly from a range, store the offset information alongside the comment.
When hovering the comment, highlight the original range.
Test Plan: {F7480926, size=full}
Maniphest Tasks: T13513
Differential Revision: https://secure.phabricator.com/D21250
Summary:
Ref T13513.
- Firefox represents multiple selected rows as a discontinuous range. Accommodate this.
- Unified diffs don't have a "copy" marker. Do something sort-of-reasonable for them.
Test Plan:
- Selected multiple lines of content in Firefox, got an option to add a comment.
- Selected content in unified mode, got an option to add a comment.
Maniphest Tasks: T13513
Differential Revision: https://secure.phabricator.com/D21249
Summary: Ref T13513. Support direct text selection for inlines. This is currently just an alternate way to get to the same place as using line numbers, but can preserve offset/range information in the future.
Test Plan:
- Selected some text, hit "c", clicked "New Inline Comment", got sensible comments on both sides of a diff in Safari, Chrome, and (with limitations) Firefox.
- Caveats: no unified support, doesn't work across lines in Firefox.
Maniphest Tasks: T13513
Differential Revision: https://secure.phabricator.com/D21248
Summary: Ref T11401. Ref T13513. This paves the way for more comment actions, particularly an edit-after-submit action.
Test Plan: Took all actions from menus, via mouse and via keyboard (where applicable).
Maniphest Tasks: T13513, T11401
Differential Revision: https://secure.phabricator.com/D21244
Summary:
Ref T13513. Currently, "View as Document Type..." lists every available engine.
This is hard to get completely right because we can't always rebuild the document ref accurately in the endpoint, but try harder to fake something reasonable.
Test Plan: Used "View as Document Type..." on Jupyter notebooks, was given "Jupyter" and "Source" as options.
Maniphest Tasks: T13513
Differential Revision: https://secure.phabricator.com/D21241
Summary:
Ref T13513. As part of inline metadata, save the document engine the change is being rendered with.
This will allow other parts of the UI to detect that an inline was created on a Jupyter notebook but is being rendered on raw source, or whatever else.
The immediate goal is to fix nonsensical inline snippet rendering in email on Jupyter notebooks.
Test Plan:
- Created inlines and replies on normal soure code, saw no document engine annotated in the database.
- Created inlines and replies on a Jupyter notebook rendered in Jupyter mode, saw "jupyter" annotations in the database.
- Swapped document engines between Jupyter and Source, etc.
Maniphest Tasks: T13513
Differential Revision: https://secure.phabricator.com/D21240
Summary:
Ref T13513. Currently, clicking "View" from the inline comment preview (below the "add comment" area at the bottom of the page) only works if the inline isn't being edited.
Update this behavior so it works on inlines in either "Viewing" or "Editing" states.
Test Plan:
- Clicked "View" on a normal inline, got jumped/selected.
- Clicked "View" on an editing inline, got jumped/selected.
Maniphest Tasks: T13513
Differential Revision: https://secure.phabricator.com/D21237
Summary:
Ref T13513. As users type text into inline comments, save the comment state as a draft on the server.
This has some rough edges, particularly around previews, but mostly works. See T13513 for notes.
Test Plan: Started an inline, typed some text, waited a second, reloaded the page, saw an editing inline with the saved text.
Maniphest Tasks: T13513
Differential Revision: https://secure.phabricator.com/D21216
Summary:
Ref T13513. This is mostly an infrastructure cleanup change.
In a perfect world, this would be a series of several changes, but they're tightly interconnected and don't have an obvious clean, nontrivial partition (or, at least, I don't see one). Followup changes will exercise this code repeatedly and all of these individual mutations are "obviously good", so I'm not too worried about the breadth of this change.
---
Inline comments are stored as transaction comments in the `PhabricatorAuditTransactionComment` and `DifferentialTransactionComment` classes.
On top of these two storage classes sit `PhabricatorAuditInlineComment` and `DifferentialInlineComment`. Historically, these were an indirection layer over significantly different storage classes, but nowadays both storage classes look pretty similar and most of the logic is actually the same. Prior to this change, these two classes were about 80% copy/pastes of one another.
Part of the reason they're so copy/pastey is that they implement a parent `Interface`. They are the only classes which implement this interface, and the interface does not provide any correctness guarantees (the storage objects are not actually constrained by it).
To simplify this:
- Make `PhabricatorInlineCommentInterface` an abstract base class instead.
- Lift as much code out of the `Audit` and `Differential` subclasses as possible.
- Delete methods which no longer have callers, or have only trivial callers.
---
Inline comments have two `View` rendering classes, `DetailView` and `EditView`. They share very little code.
Partly, this is because `EditView` does not take an `$inline` object. Historically, it needed to be able to operate on inlines that did not have an ID yet, and even further back in history this was probably just an outgrowth of a simple `<form />`.
These classes can be significantly simplified by passing an `$inline` to the `EditView`, instead of individually setting all the properties on the `View` itself. This allows the `DetailView` and `EditView` classes to share a lot of code.
The `EditView` can not fully render its content. Move the content rendering code into the view.
---
Prior to this change, some operations need to work on inlines that don't have an inline ID yet (we assign an ID the first time you "Save" a comment). Since "editing" comments will now be saved, we can instead create a row immediately.
This means that all the inline code can always rely on having a valid ID to work with, even if that ID corresponds to an empty, draft, "isEditing" comment. This simplifies more code in `EditView` and allows the "create" and "reply" code to be merged in `PhabricatorInlineCommentController`.
---
Client-side inline events are currently handled through a mixture of `ChangesetList` listeners (good) and ad-hoc row-level listeners (less good). In particular, the "save", "cancel", and "undo" events are row-level. All other events are list-level.
Move all events to list-level. This is supported by all inlines now having an ID at all stages of their lifecycle.
This allows some of the client behavior to be simplified. It currently depends on binding complex ad-hoc dictionaries into event handlers in `_drawRows()`, but it seems like almost all of this code can be removed. In fact, no more than one row ever seems to be drawn, so this code can probably be simplified further.
---
Finally, save an "isEditing" state. When we rebuild a revision on the client, click the "edit" button if it's in this state. This is a little hacky, but simpler to get into a stable state, since the row layout of an inline depends on a "view row" followed by an "edit row".
Test Plan:
- Created comments on either side of a diff.
- Edited a comment, reloaded, saw edit stick.
- Saved comments, reloaded, saw save stick.
- Edited a comment, typed text, cancelled, "unedited" to get state back.
- Created a comment, typed text, cancelled, "unedited" to get state back.
- Deleted a comment, "undeleted" to get state back.
Weirdness / known issues:
- Drafts don't autosave yet.
- Fixed in D21187:
- When you create an empty comment then reload, you get an empty editor. This is a bit silly.
- "Cancel" does not save state, but should, once drafts autosave.
- Mostly fixed in D21188:
- "Editing" comments aren't handled specially by the overall submission flow.
- "Editing" comments submitted in that state try to edit themselves again on load, which doesn't work.
Subscribers: jmeador
Maniphest Tasks: T13513
Differential Revision: https://secure.phabricator.com/D21186
Summary:
Ref T13516.
- Add an "Add Comment" navigation anchor.
- Make selection state more clear.
- Make hidden state tidier and more clear.
- Hide "View Options" in the hidden state to dodge all the weird behaviors it implies.
- Click to select/deselect changesets.
- When you open the view dropdown menu, then press "h", close the dropdown menu.
Test Plan: Fiddled with all these behaviors.
Maniphest Tasks: T13516
Differential Revision: https://secure.phabricator.com/D21161
Summary:
Ref T13516. Minor improvements here:
- Show key commands in the "View Options" dropdown.
- Organize it slightly better.
- Improve disabled item behaviors a little bit.
- Add a "Browse Directory" action.
- Rename "...in Diffusion" to "...in Repository".
- Make "d", "D", and "h" use the same targeting rules as "\".
- When you hide a file with the "h" menu item, select it.
Test Plan: Poked at the menu a lot, ran into less questionable behavior.
Maniphest Tasks: T13516
Differential Revision: https://secure.phabricator.com/D21160
Summary:
Ref T13516. Deletes all old filetree / flex / active / collapse nav code in favor of the new code.
Restores the inline tips in the path tree.
Test Plan: {F7374175}
Maniphest Tasks: T13516
Differential Revision: https://secure.phabricator.com/D21154
Summary: Ref T13516. Apply basic UI styling to the new UI and make some more interaction work.
Test Plan: {F7374096}
Maniphest Tasks: T13516
Differential Revision: https://secure.phabricator.com/D21153
Summary: Ref T13516. Generate a tree structure based on the page changesets. Still missing styles and a whole lot of behavior.
Test Plan: {F7373967}
Maniphest Tasks: T13516
Differential Revision: https://secure.phabricator.com/D21152
Summary: Ref T13516. This glues "FormationView" to "ChangesetList". The actual tree is not functional in any meaningful way yet.
Test Plan: {F7373838}
Maniphest Tasks: T13516
Differential Revision: https://secure.phabricator.com/D21151
Summary:
Ref T13515. Currently, "Open in Editor" only works with a file-level selection.
- If we have a change-level or inline-level selection, open the parent changeset.
- If we have no selection, but the banner is showing something, open the fine shown in the banner.
Test Plan: With files, inlines, changes, and no selection, pressed "\". Saw files pop open in my external editor.
Maniphest Tasks: T13515
Differential Revision: https://secure.phabricator.com/D21148
Summary:
Ref T13515. Adding "\" ("Open in External Editor") made this slighlty worse, but it was already pretty bad.
Long ago the keys had a special style on them, but this got changed and dropped somewhere around D16568 -- although at the time, I think they still had a grey background (see T11654).
Some later change removed this background.
Put the background back and separate the keystrokes into groups.
Test Plan: {F7370615}
Maniphest Tasks: T13515
Differential Revision: https://secure.phabricator.com/D21141
Summary:
Ref T13455. Update the other "view state" properties to work like "highlight" now works.
Some complexity here arises from these concerns:
- In "View Standalone", we render the changeset inline. This is useful for debugging/development, and desirable to retain.
- In all other cases, we render the changeset with AJAX.
So the client needs to be able to learn about the "state" properties of the changeset on two different flows. Prior to this change, each pathway had a fair amount of unique code.
Then, some bookkeeping issues:
- At inital rendering time, we may not know which renderer will be selected: it may be based on the client viewport dimensions.
- Prior to this change, the client didn't separate "value of the property for the changeset as rendered" and "desired value of the property".
Test Plan:
- Viewed changes in Differential, Diffusion, and in standalone mode.
- Toggled renderer, character sets, and document engine (this one isn't terribly useful). Reloaded, saw them stick.
- Started typing a comment, cancelled it, hit the undo UI.
Maniphest Tasks: T13455
Differential Revision: https://secure.phabricator.com/D21138
Summary: Ref T13515. See PHI1661. If a file is selected, add a keystroke to click the "Open in External Editor" link.
Test Plan: In Safari, Chrome, and Firefox: used "J" to select a file, then "\" to open it in an external editor. (In Safari and Chrome, this prompts.)
Maniphest Tasks: T13515
Differential Revision: https://secure.phabricator.com/D21135
Summary:
Ref T13425. Currently, code inputs and all outputs are grouped into a single block. This is fine for display notebooks but not great for diffing notebooks.
Instead, split source code input into individual lines with one line per block, and each output into its own block.
This allows you to leave actual line-by-line inlines on source, and comment on outputs individually.
Test Plan: {F6888583}
Maniphest Tasks: T13425
Differential Revision: https://secure.phabricator.com/D20840
Summary:
Depends on D20834. Ref T13425. After the change from "th" to "td" for accessibility, the algorithm picks which cells it should highlight slightly improperly (it picks too many cells since it can no longer find the line numbers).
Ideally, it would probably highlight //only// the source content, but there isn't an easy way to do this right now. Settle for an incremental improvement for the moment.
Test Plan: Hovered over line numbers, saw a more accurate highlight area.
Maniphest Tasks: T13425
Differential Revision: https://secure.phabricator.com/D20835
Summary:
Depends on D20831. Ref T13425. As an escape hatch to get out of future DocumentEngine rendering behavior, provide a "View As.." option.
Now I can break DocumentEngine real bad and no one can complain.
Test Plan: Used "View As" to swap document engines for image files.
Maniphest Tasks: T13425
Differential Revision: https://secure.phabricator.com/D20832
Summary:
Ref T12822. Fixes a few things:
- Firefox selection of weird ranges with an inline between the start and end of the range now works correctly.
- "Show More Context" rows now render, highlight, and select properly.
- Prepares for nodes to have copy-text which is different from display-text.
- Don't do anything too fancy in 1-up/unified mode. We don't copy line numbers after the `content: attr(data-n)` change, but that's as far as we go, because trying to do more than that is kind of weird and not terribly intuitive.
Test Plan:
- Selected and copied weird ranges in Firefox.
- Kept an eye on "Show More Context" rows across select and copy operations.
- Generally poked around in Safari/Firefox/Chrome.
Reviewers: amckinley
Reviewed By: amckinley
Maniphest Tasks: T12822
Differential Revision: https://secure.phabricator.com/D20192
Summary:
Ref T13161. Ref T12822. See PHI870. Long ago, the web was simple. You could leave your doors unlocked, you knew all your neighbors, crime hadn't been invented yet, and `<th>3</th>` was a perfectly fine way to render a line number cell containing the number "3".
But times have changed!
- In PHI870, this isn't good for screenreaders. We can't do much about this, so switch to `<td>`.
- In D19349 / T13105 and elsewhere, this `::after { content: attr(data-n); }` approach seems like the least bad general-purpose approach for preventing line numbers from being copied. Although Differential needs even more magic beyond this in the two-up view, this is likely good enough for the one-up view, and is consistent with other views (paste, harbormaster logs, general source display) where this technique is sufficient on its own.
The chance this breaks //something// is pretty much 100%, but we've got a week to figure out what it breaks. I couldn't find any issues immediately.
Test Plan:
- Created, edited, deleted inlines in 1-up and 2-up views.
- Replied, keyboard-navigated, keyboard-replied, drag-selected, poked and prodded everything.
Reviewers: amckinley
Reviewed By: amckinley
Maniphest Tasks: T13161, T12822
Differential Revision: https://secure.phabricator.com/D20188
Summary:
Ref T13216. See PHI985. When you click a line number to start an inline comment, we intend to initiate the action only if you used the left mouse button (desktop) or a touch (tablet/device).
We currently have a `not right` condition for doing this, but it only excludes right clicks, not middle clicks (or other nth-button clicks). The `not right` condition was sligthly easier to write, but use an `is left` condition instead of a `not right` condition.
Test Plan:
- In Safari, Firefox and Chrome:
- Used left click to start an inline.
- Used middle click to do nothing (previously: started an inline).
Reviewers: amckinley
Reviewed By: amckinley
Maniphest Tasks: T13216
Differential Revision: https://secure.phabricator.com/D19836
Summary:
Depends on D19594. See PHI823. Ref T13164.
- Add a label for the "X" button in comment areas, like "Remove Action: Change Subscribers".
- Add a label for the floating header display options menu in Differential.
- Add `role="button"` to `PHUIButtonView` objects that we render with an `<a ...>` tag.
Test Plan:
Viewed a revision with `?__aural__=true`:
- Saw "Remove Action: ..." label.
- Saw "Display Options" label.
- Used inspector to verify that some `<a class="button" ...>` now have `<a class="button" role="button" ...>`. This isn't exhaustive, but at least improves things. A specific example is the "edit", "reply", etc., actions on inline comments.
Reviewers: amckinley
Reviewed By: amckinley
Maniphest Tasks: T13164
Differential Revision: https://secure.phabricator.com/D19595
Summary:
Ref T13164. See PHI693. In Differential, you can {nav View Options > View Standalone} to get a standalone view of a single changeset. You can also arrive here via the big changeset list for revisions affecting a huge number of files.
We currently suggest that all the keyboard shortcuts work, but some do not. In particular, the "Next File" and "Previous File" keyboard shortcuts (and some similar shortcuts) do not work. In the main view, the next/previous files are on the same page. In the standalone view, we'd need to actually change the URI.
Ideally, we should do this (and, e.g., put prev/next links on the page). As a first step toward that, hide the nonfunctional shortcuts to stop users from being misled.
Test Plan:
- Viewed a revision in normal and standalone views.
- No changes in normal view, and all keys still work ("N", "P", etc).
- In standalone view, "?" no longer shows nonfunctional key commands.
Reviewers: amckinley
Reviewed By: amckinley
Maniphest Tasks: T13164
Differential Revision: https://secure.phabricator.com/D19571
Summary: Ref T13151. See PHI616. There's a bug where the current banner changeset isn't cleared correctly when we hide the banner.
Test Plan:
- View revision with several changesets.
- Scroll down slowly through first changeset until banner appears.
- Scroll up until banner disappears.
- Scroll back down.
- Before: banner fails to reappear (code still thinks it's visible and we don't want to update it).
- After: banner reappears correctly.
Reviewers: amckinley, jmeador
Reviewed By: jmeador
Maniphest Tasks: T13151
Differential Revision: https://secure.phabricator.com/D19474
Summary: Fixes T13080. The banner wasn't properly included in the sleep/wake logic.
Test Plan:
Mentioned `Dxxx` on a task. Enabled persistent chat to activate Quicksand. Reloaded page. Clicked `Dxxx`. Scrolled down until a changeset header appeared. Pressed back button.
- Before patch: ended up on task, with header still around.
- After patch: ended up on task, with header properly vanquished.
Pressed "forward", ended up back on the revision with the header again.
Maniphest Tasks: T13080
Differential Revision: https://secure.phabricator.com/D19086
Summary: See PHI356. Adds inline comment and done counts to the filetree. Also makes the filetree wider by default.
Test Plan: Fiddled with filetrees in different browsers on different revisions. Added inlines, marked them done/undone.
Differential Revision: https://secure.phabricator.com/D19041
Summary:
See PHI180. Currently, if you begin creating or editing an inline and then swap display modes (for example, with "View Unified"), your edit is lost.
Persisting the editor state is complicated and this is very rare, so just prevent the action and warn the user instead.
Also make the warning persist for a little longer since a few of the messages, including this one, take a couple seconds to read now.
Test Plan:
- Edited a comment, tried to swap display modes, got a warning.
- Swapped display modes normally with no comment being edited.
Reviewers: amckinley
Reviewed By: amckinley
Differential Revision: https://secure.phabricator.com/D18774
Summary: Ref T12733. See PHI17.
Test Plan: Pressed "A", then pressed "A".
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T12733
Differential Revision: https://secure.phabricator.com/D18274
Summary:
Fixes T8909. Ref T12733.
UI attempts to follow the mock, but is a bit rough since PHUIXButtonView without text in this menu gets weird spacing, we don't have circular buttons yet, and PHUIXActionView without an icon also gets odd spacing.
Test Plan: {F5003125}
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T12733, T8909
Differential Revision: https://secure.phabricator.com/D18128
Summary:
Ref T12733. When a revision has unsubmitted checkmarks:
- Color the banner yellow.
- Show them in the "X unsubmitted" count.
- Make the "X unsubmitted" button cycle between all drafts (written but unpublished comments) and "draft done" (checked but unsubmitted "Done" checkbox comments).
Test Plan:
- Checked a "Done" box, saw "1 unsubmitted" and yellow banner.
- Clicked "5 unsubmitted" repeatedly, saw it cycle through all unsubmitted comments and checkboxes.
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T12733
Differential Revision: https://secure.phabricator.com/D18127
Summary:
Ref T12733. This paves the way for a separate "hide" operation which completely hides things.
(I didn't extend this to the server side because that would require schema changes and the new "hide" state is client-only.)
Test Plan: Collapsed and expanded inlines, viewed tooltips.
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T12733
Differential Revision: https://secure.phabricator.com/D18126
Summary:
Fixes T12806. Ref T12733.
- Don't count synthetic (lint) comments as anything.
- When you begin writing an inline then cancel it, don't count it as anything.
- When we would show "0 / X", just show "X".
Test Plan:
- Viewed a diff with synthetic comments, no button.
- Wrote, then cancelled an inline. No "X comments".
- Clicked / unlicked "Done", saw "X" -> "1 / X".
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T12806, T12733
Differential Revision: https://secure.phabricator.com/D18103
Summary: Ref M1476. Same as D18070 but that did most of the magic.
Test Plan: {F4987961}
Reviewers: chad
Reviewed By: chad
Differential Revision: https://secure.phabricator.com/D18071
Summary: Ref T12733. This adds classes for unsubmitted/unsaved changes, and lays some groundwork for additional buttons.
Test Plan:
- Added, edited, deleted comments.
- Saw bar background color update appropriately.
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T12733
Differential Revision: https://secure.phabricator.com/D18045
