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/PropertyItem.cpp

@@ -4374,7 +4374,7 @@ void LinkLabel::onLinkChanged() {
         auto links = dlg->currentLinks();
         if(links != dlg->originalLinks()) {
             link = QVariant::fromValue(links);
-            /*emit*/ linkChanged(link);
+            Q_EMIT  linkChanged(link);
             updatePropertyLink();
         }
     }