The vertical tab list (accessed via the 'down arrow' in the tab bar, to
the right of the new tab '+' button) is now no longer working correctly
for Hi-DPI as of version 121.0-1.

I have many windows with many tabs. Previously with version 120 I had
no problem scrolling the entire tab list. Now, depending upon which tab
I have selected, I cannot scroll a certain number of tabs at the top
and/or bottom of the list into view.

Notably when trying to scroll to the very top/bottom I see the
scrollbar going out of view beyond the limits of the screen height.

I have a Hi-DPI screen set to 200% scaling. Experimenting, if I switch
to 100% scaling then the problem goes away, being able to scroll the
full list as previously (with the list drawn with 100% screen height
regardless of whether the window is maximized or not).

So it seems that a small regression was introduced.

What happens if you run with MOZ_ENABLE_WAYLAND=0 ?

Mike

Back to normal. I can scroll the full list, and the list is no longer
100% of screen height, it's located just below the button and extends
down just short of the bottom of the screen.

I happened to noticed that this also makes bug #1059242 go away.

Would you mind filing these issues upstream?
https://bugzilla.mozilla.org/enter_bug.cgi?product=Core&component=Widget%3A%20Gtk

Mike

Okay, done!