[FIX] web_editor: fix image deletion and replacement
[FIX] web_editor: fix image deletion and replacement

Deleting/replacing an image through summernote gave unexpected results.
As modifiying the related function may be tricky, this commit instead
wrap them to solve the specific erratic behavior: if the range is in/
matches an image, then simply remove the image and move the cursor to
its previous location.

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