98dd91f418
Ensure the file path G.main->filepath is always absolute and normalized. - It was possible to call WM_OT_open_mainfile with only a filename, if this resolved from the CWD, Blender's internal filepath would not be absolute as expected. - It was possible to open files on UNIX with an additional forward slash causing the blend file path it's self to contain a '//' prefix, this is error prone as running BLI_path_abs(..) multiple times would add the blend file prefix each time. - Remove requirement for "filepath" to be an absolute path when saving. Instead, expand the path - making it absolute, as this constraint wasn't applied open opening files, prefer making save/open behave consistently. - Assert when BLI_path_abs/BLI_path_rel receive a basepath that has a "//" (relative) prefix itself.
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