RE: select and META key

[Herbert Euler]

> > > >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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