[bug #34789] performSelector:withObject:afterDelay not working while a sheet is displayed

Follow-up Comment #7, bug #34789 (project gnustep):

In the mean time Apple has changed the documentation of their beginSheet:
methods to

"This method displays the sheet modally on the specified window and returns
control to the caller. Most events targeted at docWindow are prohibited while
the sheet is displayed but the app’s main run loop runs normally
otherwise."

The problem for GNUstep is that we implement sheets via the already existing
runModal: code. A complete rewrite would be required here. Patches welcome.

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