Campbell Barton
8dbd406ea0
Saving with only a filename (from Python) wasn't being prevented, while it would successfully write the file to the working-directory, path remapping and setting relative paths wouldn't work afterwards as `Main.filepath` would have no directory component. Disallow this since it's a corner case which only ever occurs when path names without any directories are used from Python, the overhead of expanding the working-directory for all data saving operations isn't worthwhile. The following changes have been made: - bpy.ops.wm.save_mainfile() without a filepath argument fails & reports and error when the file hasn't been saved. Previously it would write to "untitled.blend" and set the `G.main->filepath` to this as well. - bpy.ops.wm.save_mainfile(filepath="untitled.blend") fails & reports and error as the filename has no directory component. - `BLI_path_is_abs_from_cwd` was added to check if the path would attempt to expand to the CWD.