Take diff colors from color scheme

Change-Id: I706612a8f89917cb57b7d1e9ecebd86b3f4bcc8d
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
Reviewed-by: David Schulz <david.schulz@digia.com>

src/plugins/texteditor/texteditorconstants.h

@@ -86,6 +86,13 @@ enum TextStyle {
     C_DIFF_FILE,
     C_DIFF_LOCATION,
 
+    C_DIFF_FILE_LINE,
+    C_DIFF_CONTEXT_LINE,
+    C_DIFF_SOURCE_LINE,
+    C_DIFF_SOURCE_CHAR,
+    C_DIFF_DEST_LINE,
+    C_DIFF_DEST_CHAR,
+
     C_LAST_STYLE_SENTINEL
 };