=== Problem to solve
In the current Timeline, to scrutinize the contents of every edit, users must open the diffs in a new tab. This makes using the Timeline a multiple-tab tool, which may decrease productivity.
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=== Acceptance criteria
* When a user clicks on an edit box the diff container should open, which includes:
** A fixed header
*** "Revision as of TIMESTAMP" linked to the revision, above each revision column
*** "by USERNAME" linked to the userpage, above each revision column
*** A close button in the top right corner. When clicked, the diff container should close.
** A two-column wikitext diff with the same styling as it does on standard desktop Wikimedia diff pages ([[https://en.wikipedia.org/w/index.php?title=Typhoon_%28American_band%29&type=revision&diff=805661470&oldid=796554201|example]])
*** Line numbers
*** Color coding and highlighting
*** + and - symbols
*** The diff should have a maximum height of 500 pixels and should scroll within if needed
* Multiple diffs should be able to be opened on the same page.
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===Wireframe
{F11179054}
===Notes
There should probably be an `onClick()` handler on the revision card. When clicked, it will dispatch an action to go get the diff (if it doesn't already exist). The diff should //probably// be stored within the revision object. If this needs a loading indicator, you would probably have to add some sort of `loading` flag on //each// revision. It might not need a full-blown loading indicator, it could be something subtle... like the hover color sticks around or something like that.