Brave-browser: Black Corner on Gnome

[qingxiang-jia]

7847 Description

On Gnome 3, the browser window has a black corner next to each of its rounded corners. What's more weird is if you move it from left to right, you will see the right two corners (upper & lower) are temporarily gone. Similar behavior happens when you move it to other directions. Even more so, if there's an app behind the window, the corners are gone.

Steps to Reproduce

1. Open Brave on Gnome 3.

Actual result:

With GTK+ theme, one can see black corners.

With Dark theme, one can see black corners.

With Light theme, one can see black corners.

With any theme, when there's an app behind (even Brave itself), one doesn't see the black corners.

Expected result:

No corners.

Reproduces how often:

It happens every single time.

Brave version (brave://version info)

Brave 1.2.43 Chromium: 79.0.3945.130 (Official Build) unknown (64-bit)
Revision e22de67c28798d98833a7137c0e22876237fc40a-refs/branch-heads/3945@{#1047}
OS Linux
JavaScript V8 7.9.317.33
Flash (Disabled)
User Agent Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36
Command Line /usr/lib/brave/brave --enable-dom-distiller --disable-domain-reliability --no-pings --extension-content-verification=enforce_strict --extensions-install-verification=enforce --enable-oop-rasterization=Enabled --sync-url=https://no-thanks.invalid --enable-features=PasswordImport,WebUIDarkMode,SimplifyHttpsIndicator --disable-features=NotificationTriggers,AutofillServerCommunication,SmsReceiver,AudioServiceOutOfProcess,LookalikeUrlNavigationSuggestionsUI,WebXR,AllowPopupsDuringPageUnload,SyncUSSBookmarks,WebXrGamepadModule,UnifiedConsent --flag-switches-begin --enable-gpu-rasterization --enable-quic --enable-zero-copy --ignore-gpu-blacklist --enable-features=PasswordImport,WebUIDarkMode,SimplifyHttpsIndicator,ParallelDownloading --flag-switches-end --disable-webrtc-apm-in-audio-service
Executable Path /usr/lib/brave/brave
Profile Path /home/**/.config/BraveSoftware/Brave-Browser/Default

Version/Channel Information:

• Can you reproduce this issue with the current release? Yes
• Can you reproduce this issue with the beta channel? Didn't try
• Can you reproduce this issue with the dev channel? Didn't try
• Can you reproduce this issue with the nightly channel? Didn't try

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? No
• Does the issue resolve itself when disabling Brave Rewards? No
• Is the issue reproducible on the latest version of Chrome? Yes

Miscellaneous Information:

[qingxiang-jia]

OK. Today I found a work around:

1. Open Brave.
2. Ctrl+S, it will prompt you to save whatever page you are on.
3. Esc, and observe the black corners are gone.

This workaround isn't great because one needs to do it every time one opens Brave or open a new windows of it.

[qingxiang-jia]

Good morning @bsclifton , the GNOME/Mutter team has confirmed that this bug has been fixed in GNOME 3.36. They are currently considering a port to the current stable GNOME which is 3.34. Shall we close this?
GNOME bug tracker for this issue: https://gitlab.gnome.org/GNOME/mutter/issues/1075

[bsclifton]

@qingxiang-jia very nice! Thanks for reporting the bug there and for sharing an update on the status 😄