Image in table cell has an empty URL field when edited from context menu opened by right-click

[a-hecht]

Type of report

Bug

Provide detailed reproduction steps (if any)

1. Create a new table in ckeditor.
2. Put a single image in one of the cells.
3. Right click the image to open context menu.
4. Choose "Image Properties" from context menu to open the "Image Properties" dialog.

Expected result

The fields of the "Image Properties" dialog should be populated with the corresponding properties of the image that was right-clicked.

Actual result

The fields of the "Image Properties" dialog remain empty.

Other details

Browsers: Current versions of Chrome/Chromium and Firefox under Linux and Windows 7/10.
CKEditor versions tested: 4.10.0 and 4.9.2
The issue only occurs if "Image Properties" was called via context menu and the image is the sole content of a table cell. Double clicking the image or selecting it and calling the dialog via tool bar operates as expected.
A possible cause of this bug maybe located in the selection range handling of the function isTableSelection (in core/selection.js)

[engineering-this]

Confirmed with image plugin. Not reproducible with image2.

[dwahlqvist]

Unfortunately image2 lacks functionality we need e.g. link tab, i.e. changing to it is not a valid work around for us.
Looking forward to a bug fix :)

[iwrconsultancy]

I reported this a long while back. It seems to date back at least as far as CK4.7.
Demonstration page at http://iwrconsultancy.co.uk/ckbug
The issue seems to be in ckeditor.js itself rather than any plugin.

[f1ames]

This issue is caused by tableselection plugin which was introduced in 4.7.0. While using right mouse button to open context menu (by clicking on image) the whole table cell gets selected instead of an image and the properties are not correctly propagated to the dialog (because selection points to table cell not an image).

Bug was introduced in 4.7.0 and is still reproducible in 4.11.3.

[f1ames]

Since the issue is caused by tableselection plugin, disabling it resolves the issue which may work as a workaround.

Another workaround is to use keyboard (instead of mouse) to open context menu while the image is selected. The context menu keyboard shortcut is Shift + F10. Also Image Properties dialog can be opened via double-clicking on the image instead of opening it via context menu which also works correctly in the above scenario.