regression: Specific wikipedia page: Only part of chart legend visible with WebRender

[staktrace]

Filing for the "second regression" reported at https://bugzilla.mozilla.org/show_bug.cgi?id=1430063 where the chart goes from having streaky lines to not showing the bottom half at all.

Narrowed down the WR regression range to this:

*   45dc6a3a Auto merge of #2244 - glennw:dual-source-blending, r=kvark
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| * 5f6b3868 Add dual-source blending path for subpixel text when supported.
* 97479a41 Auto merge of #2242 - glennw:gen-seg8, r=kvark
* 9423cf20 Address review comments
* 6ef9d025 Adding edge flags to unit tests
* 479e48f5 Fix borders with pre-built segments not checking clip mask kind.
* fdac2304 Extend segment building to handle clip in/out, multiple clip regions.

[Darkspirit]

The chart legend is now visible again. (#2294.)

[glennw]

Assuming this can be closed now, please re-open otherwise!