Same steps as #2162. If the window triggers this warning when scaled up:
client @06.724 Warning: Invalid Scale Factor client @06.724 cannot scale by 50% x 50% or lower client @06.725 the scaled client screen 3840 x 2160 -> 7680 x 4320 client @06.725 would overflow the server's screen: 8192 x 4096
then something gets wedged and the window flickers and stays mostly black.
Could be related to #2214
No longer happens using attachment/ticket/2162/resize-not-reinit.patch.
Patch has been merged.
this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/2209