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/ProgressDialog.cpp

@@ -219,7 +219,7 @@ void SequencerDialog::showRemainingTime()
             QTime time( 0,0, 0);
             time = time.addSecs( rest/1000 );
             QString remain = Gui::ProgressDialog::tr("Remaining: %1").arg(time.toString());
-            QString status = QString::fromLatin1("%1\t[%2]").arg(txt).arg(remain);
+            QString status = QString::fromLatin1("%1\t[%2]").arg(txt, remain);
 
             if (thr != currentThread) {
                 QMetaObject::invokeMethod(d->dlg, "setLabelText",