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

[Yen-Ju Chen]

Follow-up Comment #31, bug #17717 (project gnustep):

I think the size of XWindowBuffer is never updated even with the latest
backend.
Here is a short track:

1. 2006-09-24 12:42:07.330 Ink[2963] rect {x = 1; y = 6; width = 390; height
= 426}, rectangle (0, 0, 390, 426)

A new Expose event goes into XGServerEvent (the new patch).
rect = [self _XWindowRectToOSWinRect:...];
Both the rect and rectangle has the right size, 390x426.

2. 2006-09-24 12:42:07.377 Ink[2963] -_exposeRect: (sx, sy) = (384, 426),
rect = {x = 0; y = 0; width = 390; height = 426}
2006-09-24 12:42:07.378 Ink[2963] sx 384, sy 426, x 0, y 0, w 390, h 426

-exposeRect: in XWindowBuffer is called with NSRect (390x426).
But the sx, sy are still 384x426, which is the size when it is created in 
-windowBufferForWindow:depthInfo:

3. 2006-09-24 12:42:07.383 Ink[2963] X-Windows error - BadValue (integer
parameter out of range for operation)
          on display: :0.0
                type: 0
       serial number: 2365
        request code: 143

Error occurs when XShmPutImage() is called.

I don't see the +windowBufferForWindow:depthInfo: is called
when new expose event occurs. Maybe that's the bug.

PS. Now, it works with XWindowBufferUseXShm 0.
PPS. It is not associated with left-mouse down. 


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