Color alone is not sufficient to visually communicate differences.
- adds `plus` and `minus` icons to the changed lines
- adds visually hidden text: `Added`, `Deleted`, and `Unchanged` to clarify the differences to assistive technologies users
Props birgire, audrasjb, kjellr, adamsilverstein.
Fixes#43532.
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`WP_Text_Diff_Renderer_Table` is used to generate the diff view in revisions, but there were some cases that could cause it to take excessive amounts of time to run.
Some noteable cases include:
- When a large number of new lines were inserted in the middle of the post from one revision to the next.
- When both revisions contain >100 lines.
- When either revision contains a lot of long lines.
In one extreme test case, the diff view took over a minute to generate. With this change, it now takes less than a second.
Merges [43775] from the 5.0 branch to trunk.
Fixes#35667.
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Prior to about 2013, many class methods lacked even access modifiers which made the `@access` notations that much more useful. Now that we've gotten to a point where the codebase is more mature from a maintenance perspective and we can finally remove these notations. Notable exceptions to this change include standalone functions notated as private as well as some classes still considered to represent "private" APIs.
See #41452.
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