Created attachment 8622102 [details] HowItIsHowItShouldBe.jpg User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0 Build ID: 20150525141253 Steps to reproduce: Drag mozilla firefox window from one screen and drop on another at the top (on Windows 7, so dropped mozilla window would appear in full screen mode on second screen). The second screen has windows taskbar on right side (i think this cause issue). Actual results: Mozilla is full screen, but doesn't pay attention on windows taskbar. Windows taskbar is 'in front' of mozilla window, and mozilla is underneath. Expected results: Mozilla windows and system taskbar should be side by side.
Summary: two screens taskbar side → drag and dropping window onto second screen with taskbar on the right side makes the maximized window disappear behind the taskbar
2slow4flo, did it use to work with old versions of Firefox?
Loic, as far as I can recall I've always had this bug since I have multiple monitors. And as I mentioned it also happens with thunderbird! It's pretty annoying for someone who switches between screens with applications, all my other programs do not have this problem, only thunderbird and firefox.
Loic, I can test specific versions for you if you want me to.
No, it's fine, I just wanted to know if it could be a recent regression in Firefox. But Firefox has many (old) issues with multiple displays, this one is just another one.
I don't know about firefox code but to me it seems like a resize should be invoked, I mean when I go from the screen with taskbar to the screen without taskbar the firefox window becomes larger to make up for the new space. Should be the same thing if you go back from the screen without taskbar to the screen with taskbar. I guess the resize does get a wrong value when asked for the new height? Does this issue only occur when a taskbar is involved? What happens if you have different screens with different resolutions?
Status: UNCONFIRMED → NEW
Ever confirmed: true
Priority: -- → P3
Can this bug get someone love? It's a VERY annoying bug for anyone who has 2 screens (with only 1 taskbar) and moves applications with WIN+R/L Arrow. I could make a showcase video or detailed steps to reproduce if you want me to.
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