"Apply First Image Size to all Images" applies automatically

[mattncsu]

Hi, I'm finding your image convert very convenient for batch converting about 50 png images for a project. Everything works as expected after uploading images and generating code but if I change any of the options or delete an image, all the images scale to match the last image.

After clicking invert:

[javl]

That isn't supposed to happen ;) I'll check it out.

[javl]

Ok, so the error is clear, there is a global variable for canvas size which gets used for all the images instead of using a separate value for each image. I'll fix it but need to find some time to do so.