image2: dialog allows resizing beyond minimum allowed size

[engineering-this]

Type of report

Bug

Provide detailed reproduction steps (if any)

1. Open test http://localhost:1030/tests/plugins/image2/manual/resizer
2. Scroll to last editor.
3. Double click on image to open dialog.
4. Enter values:
   width: 1
height: 1
5. Press OK.

Expected result

Alert appears saying that minimum allowed width/height is 15px.

Actual result

Dialog validation passes and image is very small.

Other details

https://github.com/ckeditor/ckeditor-dev/blob/7c937e875c35b9bd333fcc5de9c0910a2584ad34/plugins/image2/plugin.js#L1317-L1322

Image resizer can resize to minimum 15px width/height, however image dialog doesn't implement this in any way.

• Browser: …
• OS: …
• CKEditor version: …
• Installed CKEditor plugins: …

[engineering-this]

I will fix this with #2048 as same logic should be applied on max size.

[mlewand]

Why would you want it to restrict you from setting such size? By default the plugin does not care about that.

[engineering-this]

Resize handler restricts width/height to not less than 15px, see:

https://github.com/ckeditor/ckeditor-dev/blob/7c937e875c35b9bd333fcc5de9c0910a2584ad34/plugins/image2/plugin.js#L1317-L1322

So at first I realised it should have same limitations when using dialog.

[mlewand]

Well these two things aren't really related. So unless there's no dedicated config feature, the dialog should allow for whatever dummy value the user sets.