Revision 1459

Re-worked the support for SeamlessRDP window stacking:

* Since many window managers cannot properly restack a window between
two other windows, we need to check for this at startup.

* A new utility function, sw_wait_configurenotify, is used to wait for
the WM to process our restacking request.

* We are using XReconfigureWMWindow instead of XRestackWindows and
XRaiseWindow, to easier meet the demands of ICCCM. Restacking between
is only done if the WM is not broken, though.

* The error handler does not ignore BadMatch from ConfigureWindow
requests any longer. I haven't found any WM that gives BadMatch for
XReconfigureWMWindow.

* The test cases has been updated to test more stacking cases.


A somewhat related bug fix wrt focus handling is also included, which
prevents FOCUS messages when reverting focus from a destroyed window