image capture: no file saved when selected rectangle is 'negative'
A slight problem while using the image capture feature, to snip sections of a score and save them as PNGs: the Save dialog opened and operated as usual. However, no actual file was saved.
Turned out this was happening when the left edge of the marquee frame had been dragged past the right edge. I had hoped this would be a way to cut a stave (in continuous view) into sections which could, in principle, be pasted together again to recreate the original stave. The idea was to leave the right edge of the frame where it was, to serve as the left edge of the next capture.
The attached files were successfully created after I discovered why some of my efforts failed to save.