Clipboard/DnD leak fixes
A few fixes for leaks in the clipboard and DnD code I found in a couple of rounds of running GS in valgrind while randomly copying/pasting/dragging/dropping stuff and closing/opening windows.
A few fixes for leaks in the clipboard and DnD code I found in a couple of rounds of running GS in valgrind while randomly copying/pasting/dragging/dropping stuff and closing/opening windows.