CppEditor: Do not re-indent existing code

... in "Complete Switch Statement" quickfix.

Fixes: QTCREATORBUG-12445
Change-Id: Ic168f5b434b81d2b5f5a0d344d6c6786a75d07a5
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/cppeditor/cppquickfixes.cpp

@@ -2700,7 +2700,7 @@ public:
                        + values.join(QLatin1String(":\nbreak;\ncase "))
                        + QLatin1String(":\nbreak;"));
         currentFile->setChangeSet(changes);
-        currentFile->appendIndentRange(currentFile->range(compoundStatement));
+        currentFile->appendIndentRange(ChangeSet::Range(start, start + 1));
         currentFile->apply();
     }