[QUESTION] Mouse click on an text-property object displayed as image not working

[Christopher Miles]

Here is my Emacs package https://github.com/stardiviner/org-link-beautify

I got an problem on defining keybinding mouse left click on text-property object
which is display as image. The following code can't work when click on the
preview image. But it works fine if the text-property object is not image.

#+begin_src emacs-lisp
(defun org-link-beautify--add-keymap (start end)
  "Add keymap on link text-property. between START and END."
  (put-text-property start end 'keymap org-link-beautify-keymap))

(define-key org-link-beautify-keymap (kbd "RET") 'org-open-at-point)
(define-key org-link-beautify-keymap [mouse-1] 'org-open-at-point)
(define-key org-link-beautify-keymap (kbd "<mouse-1>") 'org-open-at-point)
#+end_src

The code of displaying image in text-property is here:

https://github.com/stardiviner/org-link-beautify/blob/master/org-link-beautify.el#L291

And here is background info of the user submitted issue, there is a gif showing 
this case.

https://github.com/stardiviner/org-link-beautify/issues/7

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