mouse.el patch for region tracking

[JD Smith]

Recently I found that Emacs 22 breaks a simple usage of mouse-drag- 
region for defining regions by mouse drag.  When transient-mark-mode  
is set, mouse-drag-region under Emacs 21 would let you define a  
region by dragging, and when the drag is released, it completes (at  
which point you can operate on the region).  This is somewhat similar  
to the XEmacs function 'mouse-track'.

With Emacs 22, several changes were introduced to mouse-drag-region  
(unrelated improvements) which broke this apparently unsupported  
usage.  This breaks a very useful drag-to-inspect functionality in my  
IDLWAVE programming mode.  The call to mouse-drag-region would not  
complete without an additional event after the drag completes.

Since I want all the rich behavior of mouse-drag-region (double- and  
triple-click select by word and line, etc.), a very simple fix is to  
re-christen 'mouse-drag-region-1' as 'mouse-drag-track', and provide  
it an optional argument to enable calling the final event handling  
code which was tripping me up.  Then I can use this functio

I have to admit having understood little of the code I've wrapped in  
'handle-terminating-event', only that it indirectly calls read-event  
via 'mouse-show-mark' and thus blocks the return of the function,  
thus breaking of my old use of mouse-drag-region.  I would appreciate  
it if you could look this over and see if it's doing what I want it  
to (inasmuch as I've communicated that).  In particular the doc  
string is a bit weak if this function were to be advertised for more  
general usage by programmers.

JD

mouse_patch_jds.diff
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