[bug #17717] Use "open panel" twice make it unusable

[Yen-Ju Chen]

Follow-up Comment #43, bug #17717 (project gnustep):

WindowMaker works fine, but not Metacity.
Here is how metacity reparents GNUstep window:

Root Window
  +- Window (the one with decoration)
    +- Plate (the part excludes decoration)
      +- GNUstep window (the same size and position of plate)

Therefore, in ReparentNotify,
we cannot simply based on the xEvent.xreparent.x and xEvent.xreparent.y.
In case of metacity, the xreparent.x and y are zero all the time,
and the mouse is off by the hight of title.

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