From 7be0209a8ff938a0fc4f851fe22d1db66bd80b91 Mon Sep 17 00:00:00 2001
From: "cmanske%netscape.com" <cmanske%netscape.com>
Date: Wed, 24 Jul 2002 03:35:40 +0000
Subject: [PATCH] Reduce memory cost of using HTML Source multiple times by
 reducing undo buffer usage. b=158860, r=brade, sr=kin, a=asa/drivers

---
 editor/ui/composer/content/editor.js | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/editor/ui/composer/content/editor.js b/editor/ui/composer/content/editor.js
index 2f00f5da93cd..cf5032b9acba 100644
--- a/editor/ui/composer/content/editor.js
+++ b/editor/ui/composer/content/editor.js
@@ -1562,6 +1562,13 @@ function SetEditMode(mode)
     // Only rebuild document if a change was made in source window
     if (gHTMLSourceChanged)
     {
+      // Reduce the undo count so we don't use too much memory
+      //   during multiple uses of source window 
+      //   (reinserting entire doc caches all nodes)
+      try {
+        gEditor.transactionManager.maxTransactionCount = 2;
+      } catch (e) {}
+
       gEditor.beginTransaction();
       try {
         // We are comming from edit source mode,
@@ -1594,6 +1601,10 @@ function SetEditMode(mode)
       }
       gEditor.endTransaction();
 
+      // Restore unlimited undo count
+      try {
+        gEditor.transactionManager.maxTransactionCount = -1;
+      } catch (e) {}
     } else {
       // We don't need to call this again, so remove handler
       gSourceContentWindow.removeEventListener("input", oninputHTMLSource, false);