diff -r 9c0506d10226 indra/llui/lltexteditor.cpp
--- a/indra/llui/lltexteditor.cpp	Mon Apr 18 09:19:05 2011 -0400
+++ b/indra/llui/lltexteditor.cpp	Mon Apr 18 21:03:01 2011 +0300
@@ -592,6 +592,10 @@
 			}
 		}
 
+		// Disabling parsing on the fly to avoid updating text segments
+		// until all indentation commands are executed.
+		mParseOnTheFly = FALSE;
+
 		// Find each start-of-line and indent it
 		do
 		{
@@ -617,6 +621,8 @@
 		}
 		while( cur < right );
 
+		mParseOnTheFly = TRUE;
+
 		if( (right < getLength()) && (text[right] == '\n') )
 		{
 			right++;