Comment 71 for bug 1003950

Here is some info from xwininfo before and after the hidden window is corrected by wmctrl, hopefully someone can make use of it:

xwininfo -name 'Software Updater'

xwininfo: Window id: 0x3000008 "Software Updater"

  Absolute upper-left X: 2655
  Absolute upper-left Y: 380
  Relative upper-left X: 2655
  Relative upper-left Y: 380
  Width: 450
  Height: 319
  Depth: 24
  Visual: 0x23
  Visual Class: TrueColor
  Border width: 0
  Class: InputOutput
  Colormap: 0x20 (installed)
  Bit Gravity State: NorthWestGravity
  Window Gravity State: NorthWestGravity
  Backing Store State: NotUseful
  Save Under State: no
  Map State: IsUnMapped
  Override Redirect State: no
  Corners: +2655+380 -735+380 -735-381 +2655-381
  -geometry 450x319+2655+380

10:59:27 [me@home] ~
wmctrl -R 'Software Updater'
11:01:28 [me@home] ~
xwininfo -name 'Software Updater'

xwininfo: Window id: 0x3000008 "Software Updater"

  Absolute upper-left X: 1078
  Absolute upper-left Y: 383
  Relative upper-left X: 0
  Relative upper-left Y: 0
  Width: 484
  Height: 116
  Depth: 24
  Visual: 0x23
  Visual Class: TrueColor
  Border width: 0
  Class: InputOutput
  Colormap: 0x20 (installed)
  Bit Gravity State: NorthWestGravity
  Window Gravity State: NorthWestGravity
  Backing Store State: NotUseful
  Save Under State: no
  Map State: IsViewable
  Override Redirect State: no
  Corners: +1078+383 -2278+383 -2278-581 +1078-581
  -geometry 484x116+1068+345