81381 2012-03-16 11:50:22 -0700 REGRESSION (r110737): Height element changes on scrolled page causes failure 2012-03-18 22:12:10 -0700 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) All All RESOLVED FIXED InRadar, Regression P1 Normal --- 1 csilv andersca andersca dbeam oldest_to_newest 580743 0 csilv 2012-03-16 11:50:22 -0700 Changing the height of an element while a page is scrolled can cause havoc on the page layout, sometimes causing it to disappear from view. This appears to be caused by this change: http://trac.webkit.org/changeset/110737/trunk/Source/WebCore/platform/ScrollView.cpp I've attached a reduction case that should make it easy to reproduce. This occurs on both WebKit nightlies and Chromium trunk builds. Reproduction steps: 1. Open attached page in a browser window. 2. Click on the "Toggle Stuff" link at the bottom. 3. If there is no scrollbar visible, make the window smaller so that the scrollbar appears. 4. Scroll down to the bottom and click "Toggle Stuff" again. At this point you should see a broken rendering... typically all page content will be gone (or at least, not visible in the layout.) 580744 1 132334 csilv 2012-03-16 11:50:50 -0700 Created attachment 132334 Reproduction case 580934 2 ap 2012-03-16 14:08:57 -0700 <rdar://problem/11066006> 581021 3 dbeam 2012-03-16 15:22:15 -0700 Do you think it'd be possible to revert the original change (110737) and re-apply when the root issue is discovered? We've gotten 10 bugs today so far all stemming from this (and those are just the ones I know about), :(. 581123 4 andersca 2012-03-16 17:18:25 -0700 (In reply to comment #3) > Do you think it'd be possible to revert the original change (110737) and re-apply when the root issue is discovered? We've gotten 10 bugs today so far all stemming from this (and those are just the ones I know about), :(. I'm working on a fix right now. 581168 5 132430 andersca 2012-03-16 18:00:02 -0700 Created attachment 132430 Patch 581180 6 andersca 2012-03-16 18:21:44 -0700 Committed r111102: <http://trac.webkit.org/changeset/111102> 581201 7 csilv 2012-03-16 18:56:19 -0700 Anders, this patch partially fixes the issue (indeed it fixes it for the reproduction case I posted above), but there are still cases where the scrollbar disappears when it shouldn't. I'll work on a followup reproduction case and attach it tonight. 581628 8 csilv 2012-03-18 22:12:10 -0700 Anders... the issue I was experiencing on Friday evening appears to be gone now. So this looks like a complete fix. Thank you for your quick response! 132334 2012-03-16 11:50:50 -0700 2012-03-16 11:50:50 -0700 Reproduction case webkit.html text/html 2656 csilv PCFET0NUWVBFIGh0bWw+CjxodG1sIGxhbmc9ImVuIj4KPGhlYWQ+CiAgPG1ldGEgY2hhcnNldD0i dXRmLTgiIC8+CiAgPHRpdGxlPlNob3dIaWRlVGVzdDwvdGl0bGU+CiAgPHN0eWxlPgogICAgYm9k eSB7CiAgICAgIGZvbnQtZmFtaWx5OiBIZWx2ZXRpY2E7CiAgICAgIGZvbnQtc2l6ZTogMjAwJTsK ICAgIH0KCiAgICAjbW9hci1zdHVmZiB7CiAgICAgIGhlaWdodDogMDsKICAgICAgb3ZlcmZsb3c6 IGhpZGRlbjsKICAgIH0KICA8L3N0eWxlPgogIDxzY3JpcHQ+CiAgICBmdW5jdGlvbiB0b2dnbGVT dHVmZigpIHsKICAgICAgdmFyIG1vYXJTdHVmZiA9IGRvY3VtZW50LmdldEVsZW1lbnRCeUlkKCdt b2FyLXN0dWZmJyk7CiAgICAgIHZhciBtb2FyU3R1ZmZDb250YWluZXIgPSBkb2N1bWVudC5nZXRF bGVtZW50QnlJZCgnbW9hci1zdHVmZi1jb250YWluZXInKTsKCiAgICAgIGlmIChtb2FyU3R1ZmYu c3R5bGUuaGVpZ2h0ID09ICcnKQogICAgICAgIG1vYXJTdHVmZi5zdHlsZS5oZWlnaHQgPSBtb2Fy U3R1ZmZDb250YWluZXIub2Zmc2V0SGVpZ2h0ICsgJ3B4JzsKICAgICAgZWxzZQogICAgICAgIG1v YXJTdHVmZi5zdHlsZS5oZWlnaHQgPSAnJzsKICAgIH0KICA8L3NjcmlwdD4KPC9oZWFkPgo8Ym9k 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