Index: /CKEditor/trunk/CHANGES.html
===================================================================
--- /CKEditor/trunk/CHANGES.html	(revision 4209)
+++ /CKEditor/trunk/CHANGES.html	(revision 4210)
@@ -66,4 +66,5 @@
 		<li><a href="http://dev.fckeditor.net/ticket/3517">#3517</a> : Fixed "Match cyclic" field in Find & Replace dialog.</li>
 		<li><a href="http://dev.fckeditor.net/ticket/4368">#4368</a> : borderColor table cell attribute haven't worked for none-IE</li>
+		<li><a href="http://dev.fckeditor.net/ticket/4203">#4203</a> : In IE quirksmode + toolbar collapsed + source mode editing block height was incorrect.</li>
 	</ul>
 	<h3>
Index: /CKEditor/trunk/_source/plugins/sourcearea/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/sourcearea/plugin.js	(revision 4209)
+++ /CKEditor/trunk/_source/plugins/sourcearea/plugin.js	(revision 4210)
@@ -65,4 +65,9 @@
 										};
 									editor.on( 'resize', onResize );
+									editor.on( 'afterCommandExec', function( event )
+									{
+										if ( event.data.name == 'toolbarCollapse' )
+											onResize();
+									});
 									styles.height = holderElement.$.clientHeight + 'px';
 								}