User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/111.0

Steps to reproduce:

Adjust Thunderbird window to half screen on a regular 1080p monitor

Actual results:

The column selector for the mail view pane is behind the scrollbar (or very narrow)

Expected results:

The column selector should retain it's normal width, or the scrollbar should start below the column selector (see second screenshot in attachment which is how the Today pane looks)

(With the today pane minimized, it is a little more clear what is happening)

Do we already have a bug for this?

(In reply to Wayne Mery (:wsmwk) from comment #2)

Do we already have a bug for this?

Can't find one. Let's keep this!
Confirming for Daily 113.0a1 (2023-03-27) (64-bit), Win10.

STR

• Reduce message pane width to the right while observing column picker in the far-right corner of column header

Actual

• When message pane is sufficiently narrow, column picker disappears behind the scroll bar
• That's because scroll bar extends upwards into column header, which is logically wrong and looks odd, actually.

Expected

• Column picker should never disappear
• Scroll bar should probably start below the column picker (as in 102, see bottom part of screenshot attachment 9325203 [details]) - after all, the column header isn't scrolled.
• For a fast and dirty temporary solution, I guess defining a min-width for the column picker which includes the scrollbar-width might work.

Super silly mistake with a simple missing CSS attribute.
Thanks for the report.

Great, May my future bug reports be at least as useful!

Pushed by mkmelin@iki.fi:
https://hg.mozilla.org/comm-central/rev/3602698b91bf
Prevent the column picker from shrinking when the window is resized. r=elizabeth