Restore stripped whitespace before reflowing text fragments #10246
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Fixes #10200. r? @pcwalton
Note: The reftest uses a transition of non-zero duration, because I couldn't find any other way to reproduce the bug. Unfortunately this makes it unreliable in debug builds. I tried to fix this using reftest-wait with setTimeout and requestAnimationFrame, but it still wouldn't complete the animation consistently. To make the test work in debug builds we may need
transitionend
events (#10245) or a different way to reproduce the bug.This change is