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assets/diff-utils: Add diff lines highlighting feature

Antoine Lambert requested to merge generated-differential-D3788-source into generated-differential-D3788-target

That new feature enables to highlight code fragments in a diff generated from the revision view by selecting a lines range with the mouse (click and Shift+click on line numbers).

Both unified and split diff can be highlighted. For the split case, only lines from the left or right part can be highlighted but also lines spanning both.

When a diff gets highlighted, an URL fragment will be added describing the highlighting state. When the revision view gets reloaded with it, the diff will be automatically computed, highlighted and displayed.

Below are some screenshots of highlighted diff examples:

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Closes #2491 (closed)

Migrated from D3788 (view on Phabricator)

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