[bug #2491] (thuban) Shape layers over WMS layer fails

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this bug's URL: http://intevation.de/rt/webrt?serial_num=2491
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Subject: Shape layers over WMS layer fails

Thuban 1.1 cvs-20040617
ChangeLog 2004-06-16

	wxPython 2.4.2.4
	Python 2.2.1
	PySQLite 0.4.1
	SQLite 2.8.0
	GDAL 1.1.8.0
	psycopg 1.0.8

	GTK 1.2.10
	proj 4.4.5

Silke and myself analysed the problem that shape layers (or other WMS layers)
can't be rendered ontop a WMS layer.

An exception is thrown:
Traceback (most recent call last):
  File "Thuban/UI/view.py", line 206, in _do_redraw
    if self.render_iter.next():
ValueError: generator already executing


We tracked the source of this exeption down to the 
call of ThubanEndBusyCursor()
in Extensions/wms/layer.py (WMSLayer.GetMapImg()).

Commenting out the BusyCursor-frame solves the problem as a workaround ...



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