982358 - Smooth out the disabling of the quit and help buttons in customize mode

Status: RESOLVED WONTFIX

(Firefox :: Toolbars and Customization, defect)

Description

[Mike Conley (:mconley) (:⚙️)]

Bug 963999 did a few things to make the transition from normal to customize mode smoother - among other things, it altered customize mode to disable the help and quit buttons in the menu panel before entering the mode.

This change resulted in a talos CART regression on Windows 8 (bug 981062).

That chunk of bug 963999 was backed out to fix the regression, but now we're switching the quit and help buttons to disabled in one frame at the end of the transition. That's not as smooth as UX wants, so we should do the following:

1) Find out if there's anything we can do with the chunk we backed out to make it not regress on Windows 8
2) Continue to disable the help and quit buttons after the customize transition, but transition their opacity over several frames instead of a single frame.

According to phlsa, 2 is less desirable than 1, but both are more desirable than what's currently on mozilla-central.