WordPress image cropping is buggy

[Jossnaz]

see here

​http://wordpress.stackexchange.com/questions/187577/cropping-image-results-in-image-being-too-small?noredirect=1#comment273421_187577

text copied from there:

This is the wordpress version 4.2.2 powell

I crop 1500 x 1000 and then press on crop, then save.

Resulting image size:

1497 x 1000

I don't know, I somehow hoped that wordpress is able to crop correctly.

The original image can be found here:

​http://img.youtube.com/vi/zXgyoDAuaH0/maxresdefault.jpg

What I did is downsize to .... x 1000 then try to crop with selection manually entering 1500 x 1000

You can actually see the bug earlier, when you enter 1500 x 1000 and then click on the selection to drag it around (right, drag the selection, not change size) it results in the number 1500 falling down to 1498.

[rachelbaker]

I successfully reproduced this bug using the latest trunk from 4.5 and the provided image. After manually setting a crop size of 1500x1000 the image size then changed to 1497x998 once I pressed the crop button, or tried to move the selection area.

[Presskopp]

Related: #18275

[johnillo]

• Crop the image in 100% scale to avoid rounding errors.
• Don't recompute selection values when selection is dragged only.
• Fix the issue where the selection values are off after the image is scaled down or restored.
• Keep aspect ratio when holding the shift key.