Anca Soncutean, Desktop QA Reporter
	Description • 6 years ago

[Affected versions]: 
- 63.0.1 (20181030165643)
- 64.0b6 (20181101155334)

[Affected platforms]:
- Windows 10 x64
- macOS 10.13
- Ubuntu 16.04 x64

[Steps to reproduce]:
1. Navigate to https://www.bing.com/
2. Open the Menu dropdown 
3. Click on the Settings option in order to expand the panel
4. Press long the "up" arrow from the keyboard to collapse the panel

[Expected result]:
- The panel collapsed, no visual glitches occurs from this action

[Actual result]:
- The panel collapsed, but visual glitches are triggered. 

[Regression range]:
- I could reproduce this issue way back to Fx 30.0a1.

[Additional Notes]:
- Nightly is not affected by this behavior, since 61.0a1 (https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=ceac91dc08bef5d099c10dda632fc3651b23c897&tochange=26bee50f8c274bdc0a38b5a77f9991f5159bc399).

	Marcos Caceres [:marcosc]
	Comment 1 • 6 years ago

Hi Olli... this feels like probably a rendering issue, not a DOM issue. WDYT?