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Fix repeated render in vtkCocoaRenderWindow

David Gobbi requested to merge dgobbi/vtk:19361-cocoa-rerender into master

Under certain circumstances, vtkCocoaRenderWindow::Render() will trigger a round of event handling, since this is needed for macOS to draw the window and its decorations. Unfortunately, the event handling could in turn trigger an additional render within the first Render() call. This fix guards against the extra render.

Closes #19361 (closed)
Backport: release
Backport: paraview/release

Edited by David Gobbi

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