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67d34a1
(Get the code!)
Patch tested successfully on OS X 10.7.4 with X11 as well as Quartz [1] backend of GTK2 (2.24.10), using built-in trackpad (MBP) and external mouse (no tests done yet with tablet, nor whether the patch allows building with GTK3 (experimental)).
During the initial tests I did have some troubles grabbing a "current" (selected) layer using the build-in trackpad as input device (where grabbing an item requires a second tap), because this tends to switch to the edit mode (rename layer) most of the time. Thus with regard to this part of the original request:
> The Raise/Lower Layer buttons are completely superfluous in
> this context and should be removed in favour of drag-and-drop.
I'd vote to keep those buttons in the dialog (there are occasions where DnD is not feasible, and a quick click on one of the buttons is faster, easier accessible and more reliably "precise" with regard to the target position).
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[1] Using the Quartz backend of GTK2 with this feature probably needs more testing (IIRC there are several open bugs reported upstream for GTK+/Quartz related to DnD, but I don't know whether those apply to this feature). During the initial tests (running from gdb) I didn't yet encounter a crash triggered by DnD in the 'Layers' dialog.