Created attachment 123318 [details] TB screenshot SUMMARY STEPS TO REPRODUCE 1. open Thunderbird or Autokey 2. expand/compress (triangle) icons don't appear in left folder panel 3. (only) on mouse over they appear OBSERVED RESULT I cannot see triangle icons (expand/collapse) in Thunderbird or Autokey. It seems that they are of white color (wrong) on white background (right): they become black and so visible only with mouse over (or if selected). EXPECTED RESULT Triangle icons should be always visible. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Neon KDE Plasma Version: 5.17 KDE Frameworks Version: 5.63 Qt Version: 5.13.1 ADDITIONAL INFORMATION
Does it reproduce if you use the Breeze GTK theme, the Breeze color scheme, and the Breeze icon theme and then restart Thunderbird?
yes: it is absolutely the same.
Thanks. Cannot reproduce with my own Thunderbird on openSUSE Tumbleweed.
I have the same problem with Neon virtualized
Tried installing "plasma-active-default-setting" e "vanilla-gnome-default-setting": nothing to do!
The fact is that the icons are not missing, but white on white background and so invisible. My question now is: where are stored triangle gtk icons and what is their name? Or where is their config file?
Created attachment 123334 [details] White triangle icons made visible (on not-white background) White triangle icons: visible as I have changed colour background.
*** This bug has been marked as a duplicate of bug 407920 ***
*** This bug has been marked as a duplicate of bug 414391 ***