diff --git a/lcl/interfaces/qt/qtobjects.pas b/lcl/interfaces/qt/qtobjects.pas
index bb8875a770..5757070431 100644
--- a/lcl/interfaces/qt/qtobjects.pas
+++ b/lcl/interfaces/qt/qtobjects.pas
@@ -830,6 +830,7 @@ function QtDefaultContext: TQtDeviceContext;
 function QtScreenContext: TQtDeviceContext;
 
 procedure AssignQtFont(FromFont: QFontH; ToFont: QFontH);
+function IsFontEqual(AFont1, AFont2: TQtFont): Boolean;
 
 implementation
 
@@ -941,6 +942,28 @@ begin
   QFont_setStyleStrategy(ToFont, QFont_styleStrategy(FromFont));
 end;
 
+function IsFontEqual(AFont1, AFont2: TQtFont): Boolean;
+var
+  AInfo1, AInfo2: TQtFontInfo;
+begin
+  Result := False;
+  if (AFont1 = nil) or (AFont2 = nil) then
+    exit;
+  if (AFont1.FHandle = nil) or (AFont2.FHandle = nil) then
+    exit;
+  AInfo1 := AFont1.FontInfo;
+  AInfo2 := AFont2.FontInfo;
+  if (AInfo1 = nil) or (AInfo2 = nil) then
+    exit;
+  Result := (AInfo1.Family = AInfo2.Family) and (AInfo1.Bold = AInfo2.Bold) and
+    (AInfo1.Italic = AInfo2.Italic) and (AInfo1.FixedPitch = AInfo2.FixedPitch) and
+    (AInfo1.Underline = AInfo2.Underline) and (AInfo1.Overline = AInfo2.OverLine) and
+    (AInfo1.PixelSize = AInfo2.PixelSize) and (AInfo1.PointSize = AInfo2.PointSize) and
+    (AInfo1.StrikeOut = AInfo2.StrikeOut) and (AInfo1.Weight = AInfo2.Weight) and
+    (AInfo1.RawMode = AInfo2.RawMode) and (AInfo1.Style = AInfo2.Style) and
+    (AInfo1.StyleHint = AInfo2.StyleHint);
+end;
+
 { TQtFontInfo }
 
 function TQtFontInfo.GetBold: Boolean;
@@ -2939,12 +2962,8 @@ begin
   SelFont := AFont;
   if (AFont.FHandle <> nil) and (Widget <> nil) then
   begin
-    if not FOwnPainter then
-    begin
-      QFnt := QPainter_font(Widget);
-      AssignQtFont(AFont.FHandle, QFnt);
-    end else
-      QPainter_setFont(Widget, QFontH(AFont.FHandle));
+    QFnt := QPainter_font(Widget);
+    AssignQtFont(AFont.FHandle, QFnt);
     vFont.Angle := AFont.Angle;
   end;
 end;
diff --git a/lcl/interfaces/qt/qtwidgets.pas b/lcl/interfaces/qt/qtwidgets.pas
index 46733c8673..4fde56a2a8 100644
--- a/lcl/interfaces/qt/qtwidgets.pas
+++ b/lcl/interfaces/qt/qtwidgets.pas
@@ -106,6 +106,8 @@ type
   TQtWidget = class(TQtObject, IUnknown)
   private
     FWidgetState: TQtWidgetStates;
+    FWidgetDefaultFont: TQtFont;
+    FWidgetLCLFont: TQtFont;
     FWidgetNeedFontColorInitialization: Boolean;
     FChildOfComplexWidget: TChildOfComplexWidget;
     FOwnWidget: Boolean;
@@ -185,6 +187,7 @@ type
     function EventFilter(Sender: QObjectH; Event: QEventH): Boolean; cdecl; override;
     function getAcceptDropFiles: Boolean; virtual;
     procedure SetNoMousePropagation(Sender: QWidgetH; const ANoMousePropagation: Boolean); virtual;
+    procedure SetLCLFont(AFont: TQtFont);
     procedure SlotShow(vShow: Boolean); cdecl;
     function SlotClose: Boolean; cdecl; virtual;
     procedure SlotDestroy; cdecl;
@@ -929,9 +932,11 @@ type
     FParentShowPassed: PtrInt;
     {$endif}
     FEditingFinishedHook: QAbstractSpinBox_hookH;
+    FLineEditHook: QObject_hookH;
     // parts
     FLineEdit: QLineEditH;
     function GetLineEdit: QLineEditH;
+    function LineEditEventFilter(Sender: QObjectH; Event: QEventH): Boolean; cdecl;
   protected
     function CreateWidget(const AParams: TCreateParams):QWidgetH; override;
     // IQtEdit implementation
@@ -1429,6 +1434,7 @@ type
   public
     constructor Create(const AParent: QWidgetH); overload;
   public
+    function EventFilter(Sender: QObjectH; Event: QEventH): Boolean; cdecl; override;
     function addMenu(AMenu: QMenuH): QActionH;
     function insertMenu(AIndex: Integer; AMenu: QMenuH): QActionH;
     function getGeometry: TRect; override;
@@ -1768,6 +1774,8 @@ begin
   
   FDefaultCursor := QCursor_create();
   QWidget_cursor(Widget, FDefaultCursor);
+  FWidgetLCLFont := nil;
+  FWidgetDefaultFont := TQtFont.Create(QWidget_font(AWidget));
 
   // set Handle->QWidget map
   setProperty(Widget, 'lclwidget', Int64(PtrUInt(Self)));
@@ -1799,6 +1807,10 @@ begin
   // retrieve default cursor on create
   FDefaultCursor := QCursor_create();
   QWidget_cursor(Widget, FDefaultCursor);
+
+  FWidgetDefaultFont := TQtFont.Create(QWidget_font(Widget));
+  FWidgetLCLFont := nil;
+
   
   // apply initial position and size
   move(FParams.X, FParams.Y);
@@ -1863,6 +1875,11 @@ begin
   if HasCaret then
     DestroyCaret;
 
+  if Assigned(FWidgetDefaultFont) then
+    FreeThenNil(FWidgetDefaultFont);
+  if Assigned(FWidgetLCLFont) then
+    FreeThenNil(FWidgetLCLFont);
+
   if FPalette <> nil then
   begin
     FPalette.Free;
@@ -2180,7 +2197,15 @@ begin
     case QEvent_type(Event) of
       QEventFontChange:
         begin
-          //TODO: for issue #19695
+          //explanation for this event usage: issue #19695
+          if not (qtwsFontUpdating in WidgetState) and
+            not LCLObject.IsParentFont then
+          begin
+            if Assigned(FWidgetLCLFont) then
+              AssignQtFont(FWidgetLCLFont.FHandle, QWidget_font(QWidgetH(Sender)))
+            else
+              AssignQtFont(FWidgetDefaultFont.FHandle, QWidget_font(QWidgetH(Sender)));
+          end;
         end;
       QEventEnabledChange:
         begin
@@ -2345,6 +2370,25 @@ begin
   QWidget_setAttribute(Sender, QtWA_NoMousePropagation, ANoMousePropagation);
 end;
 
+{------------------------------------------------------------------------------
+  Function: TQtWidget.SetLCLFont
+  Params:  None
+  Returns: Nothing
+  Sets FWidgetLCLFont , font which is different from FWidgetDefaultFont
+  so we can keep track over it inside QEventFontChange.
+  This routine does nothing if called outside of TQtWSControl.SetFont,
+  since qtwdFontUpdating must be in WidgetState
+ ------------------------------------------------------------------------------}
+procedure TQtWidget.SetLCLFont(AFont: TQtFont);
+begin
+  if not (qtwsFontUpdating in FWidgetState) then
+    exit;
+  if Assigned(FWidgetLCLFont) then
+    FreeThenNil(FWidgetLCLFont);
+  if not IsFontEqual(FWidgetDefaultFont, AFont) and (AFont.FHandle <> nil) then
+    FWidgetLCLFont := TQtFont.Create(AFont.FHandle);
+end;
+
 {------------------------------------------------------------------------------
   Function: TQtWidget.SlotShow
   Params:  None
@@ -5141,6 +5185,7 @@ begin
   // The main window takes care of the menubar handle
   if MenuBar <> nil then
   begin
+    MenuBar.DetachEvents;
     MenuBar.Widget := nil;
     MenuBar.Free;
   end;
@@ -8431,6 +8476,8 @@ begin
 
   if (FDropList <> nil) and (Sender = FDropList.Widget) then
   begin
+    if QEvent_type(Event) = QEventFontChange then
+      Result := inherited EventFilter(Sender, Event);
     QEvent_ignore(Event);
     exit;
   end;
@@ -8602,9 +8649,23 @@ function TQtAbstractSpinBox.GetLineEdit: QLineEditH;
 begin
   if FLineEdit = nil then
     FLineEdit := QLCLAbstractSpinBox_lineEditHandle(QAbstractSpinBoxH(Widget));
+  if Assigned(FLineEdit) and not Assigned(FLineEditHook) then
+  begin
+    FLineEditHook := QObject_hook_create(FLineEdit);
+    QObject_hook_hook_events(FLineEditHook, @LineEditEventFilter);
+  end;
   Result := FLineEdit;
 end;
 
+function TQtAbstractSpinBox.LineEditEventFilter(Sender: QObjectH; Event: QEventH
+  ): Boolean; cdecl;
+begin
+  Result := False;
+  QEvent_accept(Event);
+  if QEvent_type(Event) = QEventFontChange then
+    Result := EventFilter(QWidgetH(Sender), Event);
+end;
+
 function TQtAbstractSpinBox.CreateWidget(const AParams: TCreateParams): QWidgetH;
 var
   Parent: QWidgetH;
@@ -8613,6 +8674,7 @@ begin
   {$ifdef VerboseQt}
     WriteLn('TQtAbstractSpinBox.Create');
   {$endif}
+  FLineEditHook := nil;
   if AParams.WndParent <> 0 then
     Parent := TQtWidget(AParams.WndParent).GetContainerWidget
   else
@@ -8792,6 +8854,12 @@ begin
     QAbstractSpinBox_hook_destroy(FEditingFinishedHook);
     FEditingFinishedHook := nil;
   end;
+
+  if FLineEditHook <> nil then
+  begin
+    QObject_hook_destroy(FLineEditHook);
+    FLineEditHook := nil;
+  end;
   
   inherited DetachEvents;
 end;
@@ -8862,6 +8930,7 @@ begin
   FParentShowPassed := 0;
   {$endif}
   FValue := 0;
+  FLineEditHook := nil;
   if AParams.WndParent <> 0 then
     Parent := TQtWidget(AParams.WndParent).GetContainerWidget
   else
@@ -8941,6 +9010,7 @@ begin
   {$ifdef CPU64 and not WIN64}
   FParentShowPassed := 0;
   {$endif}
+  FLineEditHook := nil;
   if AParams.WndParent <> 0 then
     Parent := TQtWidget(AParams.WndParent).GetContainerWidget
   else
@@ -11586,6 +11656,8 @@ begin
   Widget := CreateWidget(FParams);
   setProperty(Widget, 'lclwidget', Int64(PtrUInt(Self)));
   QtWidgetSet.AddHandle(Self);
+  FWidgetDefaultFont := TQtFont.Create(QWidget_font(Widget));
+  FWidgetLCLFont := nil;
 end;
 
 constructor TQtMenu.Create(const AMenuItem: TMenuItem);
@@ -11989,6 +12061,8 @@ constructor TQtMenuBar.Create(const AParent: QWidgetH);
 begin
   Create;
   Widget := QMenuBar_create(AParent);
+  FWidgetDefaultFont := TQtFont.Create(QWidget_font(Widget));
+  FWidgetLCLFont := nil;
   FHeight := getHeight;
   FVisible := False;
   FIsApplicationMainMenu := False;
@@ -11998,6 +12072,15 @@ begin
   setVisible(FVisible);
 end;
 
+function TQtMenuBar.EventFilter(Sender: QObjectH; Event: QEventH): Boolean;
+  cdecl;
+begin
+  Result := False;
+  QEvent_accept(Event);
+  if (QEvent_type(Event) = QEventFontChange) then
+    AssignQtFont(FWidgetDefaultFont.FHandle, QWidget_font(QWidgetH(Sender)));
+end;
+
 function TQtMenuBar.addMenu(AMenu: QMenuH): QActionH;
 begin
   if not FVisible then
diff --git a/lcl/interfaces/qt/qtwscontrols.pp b/lcl/interfaces/qt/qtwscontrols.pp
index e42f747fdb..b51edd0744 100644
--- a/lcl/interfaces/qt/qtwscontrols.pp
+++ b/lcl/interfaces/qt/qtwscontrols.pp
@@ -578,6 +578,7 @@ begin
   QtWidget.BeginUpdate;
   QtWidget.WidgetState := QtWidget.WidgetState + [qtwsFontUpdating];
   try
+    QtWidget.SetLCLFont(TQtFont(AFont.Reference.Handle));
     QtWidget.setFont(TQtFont(AFont.Reference.Handle).FHandle);
 
     // tscrollbar, ttrackbar etc.
diff --git a/lcl/interfaces/qt/qtwsforms.pp b/lcl/interfaces/qt/qtwsforms.pp
index 6b1421856f..9b58bc2e8a 100644
--- a/lcl/interfaces/qt/qtwsforms.pp
+++ b/lcl/interfaces/qt/qtwsforms.pp
@@ -197,6 +197,7 @@ begin
 
   // Sets Various Events
   QtMainWindow.AttachEvents;
+  QtMainWindow.MenuBar.AttachEvents;
   
   if (AForm.FormStyle in [fsMDIChild]) and
      (Application.MainForm.FormStyle = fsMdiForm) and