windows jump to 0,0 when resized

[Antoine Martin]

Here with xterm:

2020-04-17 23:54:19,389 updateprop(geometry, (269, 1127, 505, 355)) previous value=(269, 1127, 499, 316)
WindowModel.do_xpra_configure_event(<X11:ConfigureNotify {'send_event': '0', 'serial': '0xf85', 'delivered_to': '0x600022', 'window': '0x600022', 'x': '0', 'y': '0', 'width': '505', 'height': '355', 'border_width': '0', 'above': '0'}>) corral=0x40001c, client=0x600022, managed=True
resize_corral_window() moving corral window from (269, 1127) to (0, 0)

[Antoine Martin]

Caused by r26055, reverted in r26141.

(the commit message for r26055 hints at a fix for a problem - but lacks the details..)