1256086 - Other applications flashing with white in background if I resize firefox window or open context menu after mouse actions

Status: VERIFIED WONTFIX

(Core :: Graphics, defect)

Description

[arni2033]

>>>   My Info:   Win7_64, Nightly 48, 32bit, ID 20160312030405
STR:
0. Switch firefox window in normal (not maximized) mode.
1. Open https://www.mozilla.org/en-US/firefox/nightly/firstrun/?oldversion=44.0.2
2. Move mouse pointer between "n" and "k" in string "Thank you", hold left mouse button
3. Move mouse pointer between "l" and "p" in string "nd help make", release left mouse button
4. Move mouse pointer between "a" and "k" in string "nd help make", hold left mouse button
5. Move mouse pointer between "o" and "u" in string "Thank you", release left mouse button
6. Repeat Steps 2-3. Repeat Steps 4-5
7. Hover mouse over identity block, hold left mouse button, move mouse over "Back" button
   in urlbar, release left mouse button
8. Click Australis Menu button (≡)
9.A) Right-click Australis Menu button (≡)
    (or, actually, any place that provides non-native context menu)
9.B) Minimize Firefox window, then click its button on task bar to restore it
9.C) Resize Firefox window using top left corner of application window

AR:  Background application using native elements flashes with white.
     Also reproducible with Notepad++ and Windows Explorer (Win+E)
ER:  Background applications shouldn't blink because of Firefox failures.

Note:
1) I can still reproduce it if I skip Step 7  [OR]  Step 8.
2) I recorded the video (A,C) using mobile phone, because for some reason there was no bug when
   almost all CPU was consumed by FRAPS. Anyway, the white flash is visible on that screencast

This is regression from bug 1232042. Regression range:
> https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=4e56796fa59b7be8d0ebc717f0a6db410cb3a0fa&tochange=2dd26535e73c160f9ce478cd0561b7722042c0d3

Comment 1

[arni2033]

Attachment: screencast 1 - Other applications flashing with wite in background if I resize firefox.mp4

Comment 2

[Milan Sreckovic [:milan] (needinfo for best results)]

That looks like fun.

Comment 3

[arni2033]

Probably not. I figured out it was caused by Fraps, more info in UserStory.

Actually, it may easily end up wontfix, since it's caused by another application,
but this being a regression is still strange.

Comment 4

[Bas Schouten (:bas.schouten)]

(In reply to Milan Sreckovic [:milan] from comment #2)
> That looks like fun.

I can see how this might confuse Fraps somewhat and maybe cause other issues I suppose.

Comment 5

[Milan Sreckovic [:milan] (needinfo for best results)]

(In reply to arni2033 from comment #3)
> Probably not. I figured out it was caused by Fraps, more info in UserStory.
> 
> Actually, it may easily end up wontfix, since it's caused by another
> application, but this being a regression is still strange.

Doing the forced present was in the patch that caused this to show up, so I can see the correlation.