thumbnails: if original image is smaller or has same size than the requested thumbnail, then copy the original

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Steps to reproduce:

1) set "large view display width" to 500 2) upload a small image (like 300x200)

Results:

a resampled copy of the image (sized 300x200 is generated), with lower quality than the original

Expected results:

original file should be used

[anti]

This was reported by someone who tested Plogger.

Maybe phpThumb has an option for this? If not, then generate_thumb could copy the original image to thumbnail if the size is smaller, then the rest of the code will not be affected.

[anti]

Fixed in [301]