Description
When opening a "save as" file prompt, it shows the directory that was last used to save an image.
However, if the save fails, a new file prompt opens, and this one seems to use the current working directory rather than the last directory used to save an image.

To Reproduce

1. Create an image over 255x255
2. Open the "save as" prompt
3. Save the image as a "ico" file (this is to ensure the save fails as the image is too big)
4. The new prompt defaults to the current working directory, rather than the last used directory.

Version
tested on both v2.1.2 and latest master (0755127)