In "Tabbed" or "Grouped Compact" toolbar modes, switching between light and dark GTK theme (Adwaita) does not refresh the styling of the toolbars.
Starting a new window or changing the toolbar style works around the issue.
Steps to Reproduce:
1. Set LibreOffice's toolbar UI to either "Tabbed" or "Grouped Compact"
2. Open gnome-tweak-tool
3. While a LibreOffice Writer/Calc/etc. GUI is open, switch the GTK theme from "Adwaita Dark" to "Adwaita", or from "Adwaita" to "Adwaita Dark".
The GUI adapts to the new theme, except the main toolbar. Particularly, the combobox/dropdown widgets change their font color but not the widget's background color, leading to illegible text.
The main toolbar should adapt, like the rest.
User Profile Reset: Yes
See attached screenshots.
Tested on Fedora 30 (the latest stable Fedora version available to me), hence the LibreOffice 6.2.x version.
Created attachment 154202 [details]
light to dark
When the app was started with the light theme
Created attachment 154203 [details]
dark to light
When the app was started with the dark theme
Ordinary bug, please fix it.