See bug 400976, comment 2: " This was repaired on trunk but it regressed again. Regression range for this is http://bonsai.mozilla.org/cvsquery.cgi?module=PhoenixTinderbox&date=explicit&mindate=1186421100&maxdate=1186423079 so it is probably caused by Bug 355789. " and this is what can be seen on trunk for that: https://bugzilla.mozilla.org/attachment.cgi?id=286077 You should see a normal popup with the word "POPUP!" in it. I'm filing this as a bug for trunk, bug 400976 is meant as the bug for the regression on branch.
Created attachment 286079 [details] testcase This testcase is almost the same as the one from bug 400976, except this uses elt.showPopup(); document.body.offsetHeight; elt.showPopup(); in a timeout. This seems to cause the issue as with the image that Ria attached, but I'm also sometimes seeing a scrollbar in the document appearing with a very large area to scroll.
When I click the testcase link here using my default profile, there's a big chance that the popup shows up correctly. To reproduce the problem, paste the testcase link in the locationbar of a new profile and hit Enter.
Component: XP Toolkit/Widgets: Menus → XUL
QA Contact: xptoolkit.menus → xptoolkit.widgets
Status: NEW → RESOLVED
Last Resolved: a year ago
Resolution: --- → WORKSFORME
Status: RESOLVED → REOPENED
Resolution: WORKSFORME → ---
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