Holding Down Mouse-Middle In Text Mode

[JCMA@MIT-OZ]

In zmacs in Release 5.0 [GC'd Beta Test rev 3],
Experimental RELATUS 84.1, microcode TMC5-MIC 262, dusty plum, on Lisp Machine Robot-4 (3600):

Holding down mouse-middle only puts a words and lines in a region.
It does lines only when the mouse is at the end of the line.

* It would nice if holding down mouse middle in text mode would establish a
  region containing the current sentence the mouse is over.

* It would be even nice if it knew about paragraphs and marked them when
  the mouse is at the beginning or end of the paragraph.

It looks as if this sort of behavior maybe a job for "Bucky Bits" as I'm not
sure marking the sentence can be differentiated from marking the paragraph.

Anyway, this behavior would improve our interface for parsing sentences
and paragraphs in ZMACS.