486086d349
Resolve a crash in !104831, which exposed an error in window creation with an empty space type. Creating a new window with an empty space type would do the following: - Create a new screen with a single empty area. - Refresh the screen, - Initialize the area. - Convert the empty area into a 3D viewport. - Run SpaceType::init() This doesn't cause any problems at the moment because `view3d_init` isn't doing anything however !104831 accesses the View3D from `area->spacedata.first` causing SCREEN_OT_area_dupli to crash. Resolve by supporting an area setup callback for WM_window_open so the area-data can be set before it's initialized. The issue remains where an unknown/empty ScrArea::spacetype results in a crash although it seems unlikely users run into this in practice. Whatever the case, that can be resolved separately.
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