Windows: MDI application leaves an empty area between toolbar and filemenu on high dpi if MDI child menu is visible

If using high dpi on a MDI application, if the MDI child is docked (maximized) and the MDI child menu is visible, there is an extra space between menubar and the toolbar.

This is reproducible with Qt example "MDI Example". In this example the "MDI child menu" refers to the Qt logo that is shown before "File" menu entry when the MDI child window is docked (maximized). The extra area is not visible if the MDI child window is floating, so a possible bug is the badly positioned or sized Qt menu logo.

Reproducible with both dpiawareness 1 and 2.

Attached screenshot has the extra area marked.