Adds an "Export Region..." option to the file menu that allows you to only export the contents of a selected region. If no region is selected, then it will crop the image to fit the bounds of the currently selected layer.
Running "Export Region..." with an area selected will export an image cropped to the selected area. For example, the following selection:
Would export this:
If you don't have an area selected, the image will be cropped to whatever layer is currently selected. For example, if we have the BoundingBox layer selected:
Then the exported image would be this:
Download krita-export-region.zip and install by going to Tools > Scripts > Import Python Plugin From File... in Krita and selecting the zip file. Once the plugin is installed, you can manage shortcuts in the shortcuts menu under Scripts > Export Region.
If you're having issues, more information on plugin installation can be found here.