RibbonTab::clicked() emits extra QApplication::focusChanged signal

Hi Folks,
Our MDI based product is consuming QTitanRibbon v4.17 and faced following issue:
when a ribbon tab is clicked, extra QApplication::focusChanged signal is emitted, as a result the active mdi child is changed.

Here is the stack trace:

_ZN11QMetaObject8activateEP7QObjectiiPPv, FP=7fffffffbe20
_ZN8QMdiArea18subWindowActivatedEP13QMdiSubWindow, FP=7fffffffbe50
_ZN8QMdiArea10childEventEP11QChildEvent, FP=7fffffffbea0
_ZN8QMdiArea16scrollContentsByEii, FP=7fffffffbed0
_ZN8QMdiArea25activatePreviousSubWindowEv, FP=7fffffffbf20
_ZN11QMetaObject8activateEP7QObjectiiPPv, FP=7fffffffc020
_ZN13QMdiSubWindow18windowStateChangedE6QFlagsIN2Qt11WindowStateEES3_, FP=7fffffffc070
_ZN13QMdiSubWindow11qt_metacastEPKc, FP=7fffffffc0d0
_ZN13QMdiSubWindow11qt_metacastEPKc, FP=7fffffffc120
_ZN11QMetaObject8activateEP7QObjectiiPPv, FP=7fffffffc220
_ZN12QApplication12focusChangedEP7QWidgetS1_, FP=7fffffffc260
_ZN19QApplicationPrivate14setFocusWidgetEP7QWidgetN2Qt11FocusReasonE, FP=7fffffffc2d0
_ZN7QWidget8setFocusEN2Qt11FocusReasonE, FP=7fffffffc330
_ZN7QWidget18focusNextPrevChildEb, FP=7fffffffc390
_ZN7QWidget18focusNextPrevChildEb, FP=7fffffffc3f0
_ZN7QWidget18focusNextPrevChildEb, FP=7fffffffc450
_ZN14QWidgetPrivate11hide_helperEv, FP=7fffffffc4c0
_ZN7QWidget10setVisibleEb, FP=7fffffffc510
_ZN6Qtitan20qtn_set_page_visibleEPNS_10RibbonPageEb, FP=7fffffffc530
_ZN6Qtitan9RibbonTab11setSelectedEb, FP=7fffffffc550
_ZN6Qtitan12RibbonTabBar11activateTabEPKNS_9RibbonTabE, FP=7fffffffc580
_ZN6Qtitan12RibbonTabBar15setCurrentIndexEi, FP=7fffffffc5a0
_ZN6Qtitan9RibbonTab7clickedEv, FP=7fffffffc5c0
_ZN6Qtitan9RibbonTab15mousePressEventEP11QMouseEvent, FP=7fffffffc5d0

As a solution we suggest, before making the tab visible, to set the focus on the clicked tab widget.

Could you reproduce it in our example of Ribbon_Application? There is an editor that can be in focus when we click on the tab, then the focus remains on the editor. This is correct, i.e. we cannot reproduce the error. How to do it?

The issue is not reproducible on ribbon application.
We workaround the issue as follow:
==== //src/qtitanribbon/4.17/linux64/src/ribbon/QtnRibbonPage.cpp#4 (text) ====
1283a1284
> page->setFocus();