Re: mouse-drag-and-drop-region

[Tak Kunihiro]

I re-re-re-revised mouse-drag-and-drop-region.  I'm sending reply to 
https://lists.gnu.org/archive/html/emacs-devel/2017-12/msg00258.html, 
ChangeLog, and patch.

* ChangeLog

2017-12-16 Tak Kunihiro <address@hidden>

        Improve comments and have four new options

        * lisp/mouse.el (mouse-drag-and-drop-region): Have option to make 
dragging cut among buffers. Make usage of tooltip option.
        (mouse-drag-and-drop-region-cut-when-buffers-differ): New variable. If 
non-nil, text is cut instead of copied when dragged among buffers.
        (mouse-drag-and-drop-region-show-tooltip): New variable. If non-nil, 
text is shown by tooltip in a graphic display.
        (mouse-drag-and-drop-region-show-cursor): New variable. If non-nil, 
point is set to where the mouse cursor.
        (mouse-drag-and-drop-region-face): New variable for face. The face is 
used to highlight the original text.

* Reply

>>> When the user just clicks within the region (no drag), window-dropped
>>> remains nil.  On such condition, window-start should not be set.
>>>
>>> Let's say there are two window top and bottom (T and B) in a frame.
>>> Scroll T to the end.  Make region in B.  Then click the region.  I
>>> will see T to be scrolled to the beginning.
>>
>> Then let's rename window-dropped to something like window-exempt
>> and set window-exempt to the window either clicked at or where the drop
>> occurs.
>
>> ​Better names might be droppped-window or destination-window.
>> If this is nil, then no drag-and-drop occurred; otherwise,
>> it is the window of the drop, so why call it window-exempt?
>
> Because the click or drop exempts that window from the point restoration
> mechanism.

OK.  I changed from `window-dropped' to `window-exempt’.

mouse.el.diff
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