RE: select and META key

["Herbert Euler" <herberteuler@hotmail.com>]

>> > >1. Emacs -Q
>> > >
>> > >2. open en elisp file. for example edebug.el
>> > >
>> > >3. Press left mouse button and select a region. Before to release left
>> > >mouse button press ALT. While keepeng ALT pressed release mouse button
>> > >
>> > >Result: a region is selected, and it cannot be unsected.
>> > >
>> > >This is a bug or an feature of emacs unknown by me?
>> >
>> > I think it is secondary selection.  See also (info "(emacs) Secondary
>> > Selection").
>> >
>> >
>>
>>
>>You are right. Thanks.
>
>However, there is surely a bug.  Since you press the Meta key
>only before releasing mouse-1, the event is slightly different from
>pressing the Meta key before pressing mouse-1: in the former
>case the first event is `down-mouse-1', and in the latter the
>first event is `M-down-mouse-1'.  Although the outcome is the
>event `M-drag-mouse-1' in both cases, `mouse-drag-secondary'
>seems not to get executed and other secondary selection
>relating commands, such as `mouse-yank-secondary' fails to be
>executed.

And the opposite behaves in this way:

1. Press M-mouse-1 to generate a M-down-mouse-1 event.
2. Move mouse to generate a mouse-movement event.
3. First release the Meta key and then mouse-1.

The outcome is drag-mouse-1 event.  However, secondary
selection has been successfully executed and pressing
M-mouse-2 can certainly yank secondary selected texts.

Are these behaviors desired?

Regards,
Guanpeng Xu

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