From 1f52f4f1522c4bc7c24fb19ba66aeaff3bf15b64 Mon Sep 17 00:00:00 2001
From: Nathan Dinsmore <nathan@users.noreply.github.com>
Date: Wed, 17 Jun 2015 18:50:56 -0400
Subject: [PATCH] Optimize StringMorph::clearSelection()

This was taking a very large chunk of CPU time when copying large scripts.
---
 morphic.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/morphic.js b/morphic.js
index aca37ede..737e944d 100644
--- a/morphic.js
+++ b/morphic.js
@@ -7402,6 +7402,7 @@ StringMorph.prototype.selectionStartSlot = function () {
 };
 
 StringMorph.prototype.clearSelection = function () {
+    if (!this.currentlySelecting && this.startMark === 0 && this.endMark === 0) return;
     this.currentlySelecting = false;
     this.startMark = 0;
     this.endMark = 0;