fix (Qt) issues found by clang's clazy tool:

+ -Wclazy-incorrect-emit
+ -Wclazy-strict-iterators
+ -Wclazy-overloaded-signal
+ -Wclazy-qstring-arg
+ -Wclazy-unused-non-trivial-variable
+ -Wclazy-container-anti-pattern
+ -Wclazy-range-loop-reference
+ -Wclazy-const-signal-or-slot
+ -Wclazy-detaching-temporary
+ -Wclazy-qfileinfo-exists

src/Gui/propertyeditor/PropertyItemDelegate.cpp

@@ -237,7 +237,7 @@ void PropertyItemDelegate::valueChanged()
     QWidget* editor = qobject_cast<QWidget*>(sender());
     if (editor) {
         Base::FlagToggler<> flag(changed);
-        commitData(editor);
+        Q_EMIT commitData(editor);
     }
 }