Image from Word is incorrectly pasted when its alternative text is an URL

[f1ames]

Type of report

Bug

Provide detailed reproduction steps (if any)

1. Go to any CKEditor instance with PFW plugin enabled (e.g. SDK PFW sample).
2. Open provided Word file (CKSource.Logo.docx) and copy its contents.
3. Paste into the editor.

Expected result

The same image as in the Word document is pasted into the editor.

Actual result

The image with src attribute pointing to URL which was present in alt attribute is used:

<img alt="https://cksource.com" height="251" src="https://cksource.com" width="251" />

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From one side it is a very specific edge case, I have discovered it when looking into the plugins code. It wasn't reported earlier which means nobody encountered it "in a wild" yet (or just didn't report it).

On the other hand I can imagine a situation when somebody may want to use and URL as an image alt text like in the example document above (and screenshot below).

Other details

• Browser: Tested on Chrome
• OS: macOS 10.13.6
• CKEditor version: Latest - 4.10.1
• Installed CKEditor plugins: Paste from Word

[Comandeer]

These images are available in RTF, so they can be easily embedded instead of linked to external source. The whole fix is just to remove the special handling of [alt] with URLs.

[jacekbogdanski]

I'm for embedding, it makes more sense as the image resource won't affect how pasting works e.g. if the resource is no longer available.