Fix a bug where we get drag events outside the window, causing us to try to...

Fix a bug where we get drag events outside the window, causing us to try to look up a line with a bogus index

PTYTextView.m

@@ -3350,6 +3350,9 @@ static double EuclideanDistance(NSPoint p1, NSPoint p2) {
     NSPoint locationInTextView = [self convertPoint:locationInWindow fromView:nil];
     locationInTextView.x = ceil(locationInTextView.x);
     locationInTextView.y = ceil(locationInTextView.y);
+    // Clamp the y position to be within the view. Sometimes we get events we probably shouldn't.
+    locationInTextView.y = MIN(self.frame.size.height - 1,
+                               MAX(0, locationInTextView.y));
     NSRect  rectInTextView = [self visibleRect];
     int x, y;
     int width = [dataSource width];