DiffEditor: Modernize

modernize-use-auto
modernize-use-override
modernize-use-equals-default

Change-Id: I4e70550ed2962781b62661a405517b5c79126bad
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/diffeditor/selectabletexteditorwidget.h

@@ -33,7 +33,7 @@ namespace Internal {
 class DiffSelection
 {
 public:
-    DiffSelection() {}
+    DiffSelection() = default;
     DiffSelection(QTextCharFormat *f) : format(f) {}
     DiffSelection(int s, int e, QTextCharFormat *f) : start(s), end(e), format(f) {}