Merge branch 'feature/bug-menubar-height' into 'develop'

Bugfix for gnomon issue number 254: the main window size can not be decreased vertically.

See merge request !57

src/dtkWidgets/dtkWidgetsMenuBar.cpp

@@ -1014,9 +1014,9 @@ void dtkWidgetsMenuBar::setStandalone(bool standalone)
 
 void dtkWidgetsMenuBar::setFixedHeight(int h)
 {
-    QFrame::setFixedHeight(h);
-
-    d->c->setFixedHeight(h);
+    QSize size { d->size, h };
+    QFrame::resize(size);
+    d->c->resize(size);
 }
 
 void dtkWidgetsMenuBar::setWidth(int width)