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Qt drag and drop

Drag&drop doesn't work under Ion in KDE apps.

This is a bug in Qt prior to release 3.3.5. The problem was that they didn't really check in what window within the WM frame stuff was dropped on, but simply took the topmost-stacked window to be it. (Subwindow lists from X are ordered by stacking). However, most programs (including xprop and xwininfo) equally stupidly take the lowest-stacked window, and Ion arranges for the visible main window to be lowest-stacked. (This is also why xprop and friends don't work on transients.) Anyhow, Qt should have been at least “fixed” to behave brokenly similarly to other apps. Or maybe it's been properly fixed to actually find the target window on the list, I don't know.