Forgot to do anything with m_observers in the DecomposedGlyphs destructor. Currently old DecomposedGlyphs objects will hang around in the GPU process until the document goes away, instead of (as is intended) when the display list they are in is removed from the GlyphDisplayListCache.
Pull request: https://github.com/WebKit/WebKit/pull/1618
Committed r295706 (251711@main): <https://commits.webkit.org/251711@main>
Reviewed commits have been landed. Closing PR #1618 and removing active labels.