If the main flow halts on a dialog box in GTK3 rendering mode, this can cause the rendering callback on the main menu bar buttons to be invoked with size 0/0. This results in an attempt to resize the background image to 0/0, which throws and takes the entire process with it.
If the main flow halts on a dialog box in GTK3 rendering mode, this can cause the rendering callback on the main menu bar buttons to be invoked with size 0/0. This results in an attempt to resize the background image to 0/0, which throws and takes the entire process with it.
Closes #78.