Index: /CKEditor/trunk/_source/plugins/undo/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/undo/plugin.js	(revision 4816)
+++ /CKEditor/trunk/_source/plugins/undo/plugin.js	(revision 4817)
@@ -243,4 +243,7 @@
 						if ( beforeTypeImage.contents != currentSnapshot )
 						{
+							// It's safe to now indicate typing state.
+							this.typing = true;
+
 							// This's a special save, with specified snapshot
 							// and without auto 'fireChange'.
@@ -264,7 +267,4 @@
 			this.lastKeystroke = keystroke;
 
-			// Ignore modifier keys. (#4673)
-			if( isModifierKey )
-				return;
 			// Create undo snap after typed too much (over 25 times).
 			if ( isEditingKey )
@@ -275,5 +275,5 @@
 				if ( this.modifiersCount > 25 )
 				{
-					this.save();
+					this.save( false, null, false );
 					this.modifiersCount = 1;
 				}
@@ -286,10 +286,9 @@
 				if ( this.typesCount > 25 )
 				{
-					this.save();
+					this.save( false, null, false );
 					this.typesCount = 1;
 				}
 			}
 
-			this.typing = true;
 		},