Created attachment 853526 [details]
Borderless door hanger UI
Description of problem: Door hanger ui does not have a border
Version-Release number of selected component (if applicable): 29a1 (Jan-17)
How reproducible: Always
Steps to Reproduce:
1. Open about:home
2. Click on the nightly box in the address bar
Actual results: Door hanger does not have a border
Expected results: Door hanger has a border
Additional info: HTTPS info, geolocation, mixed content blocking, blocked, missing, or disabled plugins are several other ways to produce a door hanger UI in Firefox.
Yes, I can reproduce it. Also "$export GTK_DEBUG=all; firefox-gtk3" shows such issue and unpainted areas.
The wrong background color here is sButtonInnerDarkBorder.
Looks like we have to pick up a different element to get those colors, because gtk3 theme has transparent border colors.
Well, the doorhanger background is rendered by sMozWindowBackground so I guess we can use it for the border too.
Movig upstrem - https://bugzilla.mozilla.org/show_bug.cgi?id=978172