968526 - The titlebar is rendered when Firefox is in fullscreen mode and unfocused

Status: RESOLVED DUPLICATE of bug 1064787

(Core :: Widget: Win32, defect)

Description

[Johan C]

STR:
  1. Toggle fullscreen mode for a tab or html5 video.
  2. Unfocus Firefox (e.g. by alt-tabbing).

Expected:
  Titlebar shouldn't render.

Actual:
  Titlebar is visible.

Note:
  I have the Aero theme enabled and the title bar renders with the Windows Classic theme.

Comment 1

[Johan C]

Attachment: screenshot

Added a screenshot with 3 examples.

In the first example, only 1px of the titlebar is rendered.

Comment 2

[Johan C]

Is this bug in the correct component?

Can I provide more information to help fix this bug?

Comment 3

[[SV Manager] Florin Mezei, QA (:FlorinMezei)]

Issue reported again in bug 1109224, for Firefox 35. 

Simple steps to reproduce (tried on Win 7 x64 with Firefox 35 Beta 8):
1. Open Firefox.
2. Toggle fullscreen (F11).
3. <Ctrl>+<T> to open a new tab.
4. Click inside the new tab page and wait for the top bar to disappear.
5. Press the <windows> key on the keyboard. 

Result: the windows start menu opens, and behind it Firefox displays with a Classic Theme titlebar overlayed on top of the page (see https://bug1109224.bugzilla.mozilla.org/attachment.cgi?id=8533859). If it doesn't reproduce on the first attempt, just try steps 4 & 5 once more.

Comment 5

[Johan C]

It's possible to reproduce this bug in the browser's fullscreen mode (F11), HTML5 video and the  fullscreen API.

Because of this I believe it boils down to a bug in the implementation of fullscreen mode for Windows (bug 68136), please correct me if I'm wrong though. Marking as blocking bug 68136 for this reason.

Comment 7

[Johan C]

I can only find reports on this issue from users running win 7, so this should probably block bug 474052.