Fix navigation bar (current folder bar) positioning when switching between classic and vertical layout

[RealRaven2000]

When switching to vertical layout in Thunderbird 115, the toolbar is not moved to the top (above the message preview) but to the bottom of the thread pane. When opening a new tab in the mode (or restarting Thunderbird) it appears in the correct position.

Required: Write code to detect the switch between the layouts and lift all navigation bars to the correct position.

[RealRaven2000]

I added an observer to the3pane code, that looks at changes of the global (legacy) preference mail.pane_config.dynamic. Once this changes it calls the code QuickFolders.Interface.liftNavigationbar() which moves the current folder bar to the correct position.

One future improvement I would like is to relocate it on top of the message preview instead of the thread pane. This is probably going to land in a near future version (It's difficult, moving it into the DOM view breaks the Thunderbird message pane code).

Test version:

QuickFolders-mx-6.2pre44.zip

[RealRaven2000]

Fixed in 6.2 - Published 30/08/2023