When a find operation fails to find a match, the find dialog's text entry field sets the background color of selected text to dark red. This is fine if the Gtk theme happens to use a light color for selected text, but for other themes, it makes the text nearly unreadable.
![Screenshot_2019-10-01_12-31-17](https://user-images.githubusercontent.com/322134/65994475-32a58f80-e448-11e9...)
If Geany is going to set a background color here, it should set a foreground color as well, in order to avoid this problem.