VCS: Highlight commit lines in log editor

Task-number: QTCREATORBUG-13997
Change-Id: I7d9a85cd6022a20a487010a35164ff100b72218d
Reviewed-by: Thorben Kroeger <thorbenkroeger@gmail.com>
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>

src/plugins/texteditor/texteditorconstants.h

@@ -95,6 +95,8 @@ enum TextStyle {
     C_DIFF_DEST_LINE,
     C_DIFF_DEST_CHAR,
 
+    C_LOG_CHANGE_LINE,
+
     C_LAST_STYLE_SENTINEL
 };