tree fed49af6a2bbc00478227659d164c29df6ac24ac
parent 0b566ae557eb6cdc985a0d55f4085260748e6336
author wenson_hsieh@apple.com <wenson_hsieh@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1563295941 +0000
committer wenson_hsieh@apple.com <wenson_hsieh@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1563295941 +0000

[Text autosizing] [iPadOS] Paragraph text on the front page of LinkedIn.com is not boosted
https://bugs.webkit.org/show_bug.cgi?id=199827
<rdar://problem/53152660>

Reviewed by Zalan Bujtas.

Source/WebCore:

After r247467, we try to avoid boosting some text that might cause vertical overflow due to line height
increasing inside a container that expects a fixed integer number of lines. However, in the case of
linkedin.com, the line height specified is a fixed value of 26px, which greatly exceeds the specified font size
of 14px. In this case, it's safe to boost font size, since doing so would not affect the line height at all.

To handle this case, don't avoid text autosizing due to the "fixed number of lines" heuristic if the line height
is fixed, and is much larger than the font size.

Test: fast/text-autosizing/ios/idempotentmode/idempotent-autosizing-candidates.html

* rendering/style/TextSizeAdjustment.cpp:
(WebCore::AutosizeStatus::updateStatus):

LayoutTests:

Add a new test case, inspired by paragraph text in a post on linkedin.com. This text should get autosized.

* fast/text-autosizing/ios/idempotentmode/idempotent-autosizing-candidates-expected.txt:
* fast/text-autosizing/ios/idempotentmode/idempotent-autosizing-candidates.html:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@247484 268f45cc-cd09-0410-ab3c-d52691b4dbfc