1st OBVIOUS problem? the EXIT button is hidden
Yes, program developed for large screen.
1) Stupid&simple: create new Glade layout for 600 width screen
2) Good way: dynamic resize buttons and button images for diffirent resolutions (and, may be, cache new images)
Can you do this while porting? Now used 64px buttons, and 54px images.
If screen to scroll up/down gesture (swipe), folder/file under a finger becomes active.
Known bug. You can use scrollbars for fast scrolling. How can I handle gestures in Glade? I don't know