Text width cache returns incorrect widths when kerned and unkerned versions of a font are used repeatedly - #77426

565fe4e

Text width cache returns incorrect widths when kerned and unkerned versions of a font are used repeatedly
https://bugs.webkit.org/show_bug.cgi?id=327981

Reviewed by NOBODY (OOPS!).

Add kerning to FontCascadeCacheKey so each kerning setting gets its own
FontCascadeFonts.

Test: fast/text/font-kerning-width-cache.html

* LayoutTests/fast/text/font-kerning-width-cache-expected.txt: Added.
* LayoutTests/fast/text/font-kerning-width-cache.html: Added.
* Source/WebCore/platform/graphics/FontCascadeCache.cpp:
(WebCore::makeFontCascadeCacheKey):
* Source/WebCore/platform/graphics/FontCascadeCache.h:
(WebCore::add):

565fe4e

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