diff -uNr qt-everywhere-opensource-src-4.6.1.orig/src/corelib/tools//qtextboundaryfinder.cpp qt-everywhere-opensource-src-4.6.1/src/corelib/tools//qtextboundaryfinder.cpp
--- qt-everywhere-opensource-src-4.6.1.orig/src/corelib/tools//qtextboundaryfinder.cpp	2010-01-16 00:01:36.000000000 +0700
+++ qt-everywhere-opensource-src-4.6.1/src/corelib/tools//qtextboundaryfinder.cpp	2010-02-02 12:00:39.533718630 +0700
@@ -362,7 +362,7 @@
             ++pos;
         break;
     case Line:
-        while (pos < length && d->attributes[pos].lineBreakType < HB_Break)
+        while (pos < length && d->attributes[pos-1].lineBreakType < HB_Break)
             ++pos;
         break;
     }
@@ -404,7 +404,7 @@
             --pos;
         break;
     case Line:
-        while (pos > 0 && d->attributes[pos].lineBreakType < HB_Break)
+        while (pos > 0 && d->attributes[pos-1].lineBreakType < HB_Break)
             --pos;
         break;
     }