gitk: Do not mistake unchanged lines for submodule changes

Unchanged lines are prefixed with a white-space, thus unchanged lines
starting with either " <" or " >" are mistaken for submodule changes.
Check if a line starts with either "  <" or "  >" only if we are listing
the changes of a submodule.

Signed-off-by: Gabriele Mazzotta <gabriele.mzt@gmail.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

Author: gm-vm

gitk

@@ -8228,11 +8228,11 @@ proc parseblobdiffline {ids line} {
 	} else {
 	    $ctext insert end "$line\n" filesep
 	}
-    } elseif {![string compare -length 3 "  >" $line]} {
+    } elseif {$currdiffsubmod != "" && ![string compare -length 3 "  >" $line]} {
 	set $currdiffsubmod ""
 	set line [encoding convertfrom $diffencoding $line]
 	$ctext insert end "$line\n" dresult
-    } elseif {![string compare -length 3 "  <" $line]} {
+    } elseif {$currdiffsubmod != "" && ![string compare -length 3 "  <" $line]} {
 	set $currdiffsubmod ""
 	set line [encoding convertfrom $diffencoding $line]
 	$ctext insert end "$line\n" d0