SAVEAS / QSAVE with a .svg, .png or .pdf path wrote the export and then
marked the drawing saved under that file: the title became the image name,
the unsaved changes were cleared (no "Save changes?" on close) and a later
Save wrote the image again. Exports now only store the file; DXF/DWG saves
are unchanged.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>