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plan9: holding alt with left mouse button moves the selection to the clicked cell

--- a/plan9.c

+++ b/plan9.c

@@ -1159,6 +1159,7 @@

 	Keyboardctl kctl;

 	Rune r;

 	Mouse m;

+	Point p;

 	char tmp[256];

 	int oldw, oldh, w, h, n, oldbuttons;

 	long seed;

@@ -1314,7 +1315,14 @@

 		case Cmouse:

 			if (m.buttons == 1) {

-				if (oldbuttons == 0 && !shiftdown) {

+				if (altdown) {

+					p = ptmouse(m.xy);

+					if (!eqpt(p, cur)) {

+						snapshot();

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

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

+					}

+				} else if (oldbuttons == 0 && !shiftdown) {

 					cur = ptmouse(m.xy);

 					sel.min = cur;

 					sel.max = cur;