_CGXRemoveWindowFromWindowMovementGroup: window (0x...) is not attached to window (0x..)

Question

So I seem to be getting this really weird issue when dismissing a sheet sometimes. I call

[self.window endSheet:sheetWindow];

It doesn't happen all the time, but when it happens, the sheet "disappears" without animation and I see this logs out in Console:

_CGXRemoveWindowFromWindowMovementGroup: window is not attached to window

I'm 100% certain that the window is a sheet on window at the time I call endSheet:

Also weird because clicking in self.window after dismissing the sheet does not work (that is, clicking on clickable views like buttons and such does nothing) until I bring another app to the foreground, and then click to bring my app frontmost again.

Anyone run into this and perhaps know what could be causing it?

Thanks

AppKit

844

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Macho Man Randy Savage

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Answer 1

If I log out:

NSWindow *sheetParent = theSheetWindow.sheetParent;
    NSLog(@"Sheet parent: %@",sheetParent);

Just before the call to endSheet: ...I can see that the property is set to self.window...still no idea what's causing this to happen.

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Macho Man Randy Savage

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Answer 2

seems to occur *after* opening another separate window (and then closing it) *just before*...running the sheet. Still haven't been able to find a workaround.

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Macho Man Randy Savage

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Answer 3

Well....I think I found a workaround. Looks like this is a really weird bug. If just before calling end sheet if I send NSApp an activateIgnoringOtherApps: message the sheet seems to always dismiss as expected.

As mentioend earlier, this only happens if I open another window first, close it, then show the sheet back in the "main window". Why, I do not know...

My app is already active, as it just got a key down event to dismiss the sheet (the return key). Not sure why the system loses track of the sheet without the activateIgnoreOtherApps call...

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Macho Man Randy Savage

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_CGXRemoveWindowFromWindowMovementGroup: window (0x...) is not attached to window (0x..)

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