1554507 - fullscreen button icons behave inconsistently

Status: UNCONFIRMED

(Firefox :: Toolbars and Customization, defect, P5)

Description

[Julian]

Attachment: fullscreen_icons.png

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0

Steps to reproduce:

1. Use Customize... to put the full screen toggle button on the toolbar.
2. Make sure Firefox is not in full screen mode.
3. Notice that the arrows in the icon on the full screen button on the toolbar point outward. Similarly, the arrows in the icon on the full screen button on the hamburger menu also point outward.
4. Click on the full screen toggle button to go into full screen mode.

Actual results:

In full screen mode, the arrows in the icon on the full screen button in the hamburger menu point inward to show that if we click it, we can exit full screen mode. BUT the arrows in the icon on the full screen button in the toolbar still point outward. (Please see attached screenshot.)

Expected results:

The arrows in the icon on the full screen button in the toolbar should point inward when we're in full screen mode.