1 paste_in_new_window.png consists of white lines on black ("Hermann illusion")
2 with a transparent rectangle in the middle.
4 Use this to test "Edit / Paste in New Window".
6 Prior to 2007-10-07, a troublesome sequence of steps with this image was:
8 1. Set the selection transparency mode to Transparent
11 4. Paste in New Window (Ctrl+Shift+V)
13 The white lines became transparent.
15 This testcase was originally by Thurston Dang.