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/EditorView.cpp

@@ -479,7 +479,7 @@ void EditorView::printPdf()
 void EditorView::setCurrentFileName(const QString &fileName)
 {
     d->fileName = fileName;
-    /*emit*/ changeFileName(d->fileName);
+    Q_EMIT changeFileName(d->fileName);
     d->textEdit->document()->setModified(false);
 
     QString name;