Krita/docs/Paint Outside Canvas Problem

Problems

When we allow the user to paint outside canvas area, we face to the following problems:

1. Preview of that layers contains extra data (can be fixed by adding KisPaintDevice::createImageThumbnail() method)
2. PSD and KRA files are too heavy in size

Possible Solutions

1. Add a shortcut to clean area outside canvas
   • what should be its name?
   • need to paint an icon!
   • wiki-manual entry
2. Add a checkbox and/or a user warning before saving the image that the image has some extra data. Otherwise the user will forget to press this shortcut before saving.
3. Add a checkbox to disable painting outside canvas borders. Only painting, other tools should work fine. More than that the user should be able to start a stroke outside the canvas borders.
   • name?
   • icon is needed
   • wiki-manual entry