image2: resizing to minimum size doesn't update dialogs values

[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. Resize image to minimum size.
4. Double click on image to open dialog.

Expected result

• Dialogs fields match image properties.

Actual result

• width and height are unset.

Other details

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

This is the part of mousemove handler. When mouse moves decreasing image size, attributes of img element are changed, but widget.data is updated in mouseup handler only if updateData is set to true. So in this scenario image size is changed, but the second one of dimensions is lower than allowed updateData is overwritten with false and thus data is not updated, and dialog shows previews value.

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

[engineering-this]

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