[Webkit-unassigned] [Bug 153404] REGRESSION(r188659): Non main frame scrollable areas don't work for pages restored from the page cache

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=153404

--- Comment #7 from Carlos Garcia Campos <cgarcia at igalia.com> ---
Created attachment 271347
  --> https://bugs.webkit.org/attachment.cgi?id=271347&action=review
Different WIP approach

So, according to bug #148182 crashes happen when restoring from page cache because of pointers to ScrollableAreas that has already been removed. So, I think the actual bug is that those ScrollableAreas haven't been unregistered themselves when they were destroyed. RenderListBox and RenderLayer already do that, so I think the bug is in Mac PDFPlugin, and maybe in FrameView. This patch could also fix the crash without having to clear/restore scrollable areas when entering/restoring from the page cache. What do you think?

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