maring-left/right incorrectly updated when switing between LTR and RTL
Look at the spacing between the tabs' icon and label, the widget whose properties are displayed is a sibbling of the label (in a box).
In the code, only margin-end
is set to 6, but as you can see in RTL the margin is added to the start/right of the icon instead of to the end/left.
This is GTK 3.24.24 from Flatpak master.