Generating thumbnails matching original image dimensions

[galbaras]

When the thumbnail size matches the uploaded image dimensions precisely, the thumbnail is created.

In image_resize_dimensions(), line 551 is:

if ( $new_w >= $orig_w && $new_h >= $orig_h && $dest_w != $orig_w && $dest_h != $orig_h ) {

This means that when $dest_w == $orig_w or $dest_h == $orig_h, a new file is created, when it shouldn't be, although the new file's dimensions match that of the original file.

The first 2 conditions ($new_w >= $orig_w && $new_h >= $orig_h) should be enough prevent the creation of an equal or larger file.

So the new code should be:

if ( $new_w >= $orig_w && $new_h >= $orig_h ) {

[desrosj]

Duplicate of #32437.