1429626 - toolbar button is flashing, and surplus repainting if WebRender enabled

Status: RESOLVED WORKSFORME

(Core :: Graphics: WebRender, defect, P1)

Description

[Alice0775 White]

Attachment: screencast

toolbar button is flashing while page loading / when mouse moving

Reproducible: yes

Steps To Reproduce:
(prepare)
1. Enable webrender
   user_pref("gfx.webrender.enabled", true);
   user_pref("gfx.webrender.blob-images", true);
   user_pref("image.mem.shared", true);
   
(for example)
2. Make sure there is only home tab in 1st tab 
3. Open https://www.mozilla.org/en-US/firefox/nightly/firstrun/ in 1st foreground tab
4. Open http://forum.mozilla.gr.jp/ in the same 1st tab

5. Open https://login.opendns.com/?return_to=https%3A%2F%2Fdashboard.opendns.com%2F in 2nd foreground tab
6. Open http://www.getginger.jp/  in 3rd foreground tab
7. Switch to 1st tab and click Back button twice
8. Switch to 3rd tab (and click Reload button if need)

Comment 1

[Alice0775 White]

It seems that the toolbar is continuously/surplus repainting.

Mark as "perf"

Comment 2

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

As of the latest nightly, just need to set gfx.webrender.all to true.  This is related to a number of other bugs, probably the same root cause, but different ways to reproduce, so keeping them as non-duplicates.

Comment 3

[Alice0775 White]

no longer reproduce on Nightly60.0a1.