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Single mouse clicks to toggle individual grid edges stopped working
in r8414 as a side effect of reorganisation in interpret_move().
Reinstate them.

[originally from svn r8692]
[r8414 == 54801998744a69786a49ebe0688942ae7b57525b]

--- a/rect.c

+++ b/rect.c

@@ -2431,9 +2431,10 @@

 	(xc != ui->drag_end_x || yc != ui->drag_end_y)) {

 	int t;

+	if (ui->drag_end_x != -1 && ui->drag_end_y != -1)

+	    ui->dragged = TRUE;

         ui->drag_end_x = xc;

         ui->drag_end_y = yc;

-        ui->dragged = TRUE;

         active = TRUE;

 	if (xc >= 0 && xc <= 2*from->w &&

@@ -2813,7 +2814,8 @@

     {

 	char buf[256];

-	if (ui->x1 >= 0 && ui->y1 >= 0 &&

+	if (ui->dragged &&

+	    ui->x1 >= 0 && ui->y1 >= 0 &&

 	    ui->x2 >= 0 && ui->y2 >= 0) {

 	    sprintf(buf, "%dx%d ",

 		    ui->x2-ui->x1,