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plan9: moving with alt+lmb: take a snapshot once when dragging

--- a/plan9.c

+++ b/plan9.c

@@ -1318,7 +1318,8 @@

 				if (altdown) {

 					p = ptmouse(m.xy);

 					if (!eqpt(p, cur)) {

-						snapshot();

+						if (oldbuttons == 0)

+							snapshot();

 						selmove(p.x-cur.x, p.y-cur.y);

 						curmove(p.x-cur.x, p.y-cur.y);

 					}