It is too easy to inadvertently process multiple images upon selecting multiple images in the image browser.
Open an image
Select the crop tool
Hit Control-A on the keyboard (inadvertently)
Use the crop tool
Result: all images in the image browser are cropped on the go.
Suggestion: (** edited**) Unless user makes an explicit choice to apply edits to a set of images, tool settings should only be effective on the image being displayed.