Fix id_map error on open_pxo_file as well as grid being wrong size #765
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This fixes this error that showed up in the #698 PR when opening a pxo file (without any changes to the empty default file):
This was caused by Global.canvas.update() not being called
Also fixes the grid not being updated, and maybe other bugs.
Not sure if just using the Project.change_project() will cause other issues though