Localstorage quota is exceeded when a sufficiently large image is imported

[lbussell]

Possible solutions:

• Limit image imports to a specific size
• Automatically downscale the image if it's too large
• Disable localstorage for sufficiently large images
• Ask the user whether they would like to import into a new image or simply drag the imported image around on the existing image.
  • When importing into a new image, ask the user what size they would like it to be and scale the image down.