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/App/DocumentObject.cpp

@@ -708,13 +708,13 @@ bool DocumentObject::removeDynamicProperty(const char* name)
     auto expressions = ExpressionEngine.getExpressions();
     std::vector<App::ObjectIdentifier> removeExpr;
 
-    for (auto it : expressions) {
+    for (const auto& it : expressions) {
         if (it.first.getProperty() == prop) {
             removeExpr.push_back(it.first);
         }
     }
 
-    for (auto it : removeExpr) {
+    for (const auto& it : removeExpr) {
         ExpressionEngine.setValue(it, std::shared_ptr<Expression>());
     }