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Cancel dragging in Pearl by pressing Escape or Backspace.

--- a/pearl.c

+++ b/pearl.c

@@ -2058,6 +2058,11 @@

 	}

     }

+    if (button == 27 || button == '\b') {

+        ui->ndragcoords = -1;

+        return "";

+    }

+

     if (release) {

         if (ui->ndragcoords > 0) {

             /* End of a drag: process the cached line data. */

--- a/puzzles.but

+++ b/puzzles.but

@@ -2989,9 +2989,10 @@

 turns, you might mark the one way it \e{can't} go with a cross.)

 Alternatively, use the cursor keys to move the cursor.  Use the Enter

-key to begin and end keyboard `drag' operations.  Use the Space key to

-cancel the drag.  Or, hold Control while dragging with the cursor keys

-to toggle segments as you move between squares.

+key to begin and end keyboard `drag' operations.  Use the Space,

+Escape or Backspace keys to cancel the drag.  Or, hold Control while

+dragging with the cursor keys to toggle segments as you move between

+squares.

 Pressing Control-Shift-arrowkey or Shift-arrowkey simulates a left or

 right click, respectively, on the edge in the direction of the key.