Closed Bug 252158 Opened 18 years ago Closed 9 years ago
Large select lists not always scrolling the selected item into view
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7) Gecko/20040701 Firefox/0.9.1 Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7) Gecko/20040701 Firefox/0.9.1 On pages with multiple select lists of significant length, the `selected' item is not always shown in the select list's viewport (not the browser viewport, the viewport of the select list). The select list stays as if no item was marked selected - only the top of the list is displayed. However, if you scroll down to find the item that is supposed to be selected, it *is* selected - firefox just has not scrolled the list to bring it into view. I have reproduced this problem on windows and on linux with Firefox 0.9. I have also reproduced it with Mozilla 1.7 on linux. I have access to Netscape 7.1 on windows which does not exhibit this behavior, but do not have access to any older mozilla builds to attempt to reproduce. Reproducible: Sometimes Steps to Reproduce: 1.Load a page with multiple large select lists (I'll attach a perl script to generate one). 2.Shift+Reload several times. Actual Results: Sometime the correct items will be selected and displayed. Other times, one or more select lists will not show the selected item. Expected Results: Firefox should always show the selected item.
Is this a problem with a current trunk build? The layout engine in the branch builds is pretty old...
Apologies for putting this under the trunk when I had not tested it there... However, it *is* still a problem in both nightlies: http://ftp.mozilla.org/pub/mozilla.org/mozilla/nightly/latest-trunk/mozilla-i686-pc-linux-gnu.tar.gz http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/latest-trunk/firefox-i686-linux-gtk2+xft.tar.gz Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8a3) Gecko/20040719 Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8a3) Gecko/20040719 Firefox/0.9.1+ Both nightlies continue to exhibit the same behavior. Repeated Shift+reloads change the display of the select lists. Sometimes one or more of the lists does not show the `selected' items. Sometimes all of the lists correctly show the `selected' items.
Confirming bug, 2005-01-28-05 trunk Linux. The selected item in each list is selected but the middle list does not scroll it into view for some reason.
Status: UNCONFIRMED → NEW
Ever confirmed: true
My last comment is when I loaded the testcase from disc. Loading it from Bugzilla (attachment 172783 [details]) gives different results - none of the selected items are scrolled into view. When I scroll manually I can see the selected item highlighted so the problem seems to be the scrolling part only.
Summary: Multiple large select lists not always showing the selected item → Large select lists not always scrolling the selected item into view
The problem is that we couldn't get the option's primary frame, at line 2757: http://bonsai.mozilla.org/cvsblame.cgi?file=mozilla/layout/forms/nsListControlFrame.cpp&rev=1.352&root=/cvsroot&mark=2752,2757#2735 If I stick a 'FlushPendingNotifications(Flush_Frames);' in there it fixes the problem but is seems a bit riscy perhaps, since 'nsListControlFrame::Reflow' calls 'ScrollToIndex()' here: http://bonsai.mozilla.org/cvsblame.cgi?file=mozilla/layout/forms/nsListControlFrame.cpp&rev=1.352&root=/cvsroot&mark=740-754#738 Boris, thoughts?
Assignee: nobody → mats.palmgren
Flushing frames in the middle of reflow is no good. Maybe we're calling ScrollToFrame too early? Or not calling it after the kids have been constructed? What's the callstack for the ScrollToFrame call during which the kids are around but not yet in the frame tree? Perhaps flushing frames somewhere further up the stack would be right.
*** Bug 286199 has been marked as a duplicate of this bug. ***
Works for me in a recent Nightly (Fx21) on Linux, OSX and Win7.
Status: NEW → RESOLVED
Closed: 9 years ago
Resolution: --- → WORKSFORME
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