I have a suggestion on how to solve this but I'm not sure if it's doable.
When picking the color for backgrounds with tags (GTG/taskbrowser/tasktree.py:111-114) if the result color is None or if bg_color_enable is False, then the background color is set to the default cell render color.
There is a slight problem though, this default cell color can only be obtained after receiving map-event.
I have a suggestion on how to solve this but I'm not sure if it's doable.
When picking the color for backgrounds with tags (GTG/taskbrowse r/tasktree. py:111- 114) if the result color is None or if bg_color_enable is False, then the background color is set to the default cell render color.
There is a slight problem though, this default cell color can only be obtained after receiving map-event.