gtk3: Correctly mirror popovers in rtl ui

e.g. formula prompt or fill series in Calc. The reason is that for
this particular vcl::Window, HasMirroredGraphics() != IsRTLEnabled().

Change-Id: Icd4bb2d22ba77d64c32b243d9c07745824e5e558
Reviewed-on: https://gerrit.libreoffice.org/55936
Tested-by: Jenkins
Reviewed-by: Maxim Monastirsky <momonasmon@gmail.com>

vcl/inc/salframe.hxx

@@ -247,13 +247,13 @@ public:
     }
 
     // return !0 to indicate popovers are shown natively, 0 otherwise
-    virtual void*           ShowPopover(const OUString& /*rHelpText*/, const tools::Rectangle& /*rHelpArea*/, QuickHelpFlags /*nFlags*/)
+    virtual void*           ShowPopover(const OUString& /*rHelpText*/, vcl::Window* /*pParent*/, const tools::Rectangle& /*rHelpArea*/, QuickHelpFlags /*nFlags*/)
     {
         return nullptr;
     }
 
     // return true to indicate popovers are shown natively, false otherwise
-    virtual bool            UpdatePopover(void* /*nId*/, const OUString& /*rHelpText*/, const tools::Rectangle& /*rHelpArea*/)
+    virtual bool            UpdatePopover(void* /*nId*/, const OUString& /*rHelpText*/, vcl::Window* /*pParent*/, const tools::Rectangle& /*rHelpArea*/)
     {
         return false;
     }

vcl/inc/unx/gtk/gtkframe.hxx

@@ -538,8 +538,8 @@ public:
     virtual void                PositionByToolkit(const tools::Rectangle& rRect, FloatWinPopupFlags nFlags) override;
     virtual void                SetModal(bool bModal) override;
     virtual bool                ShowTooltip(const OUString& rHelpText, const tools::Rectangle& rHelpArea) override;
-    virtual void*               ShowPopover(const OUString& rHelpText, const tools::Rectangle& rHelpArea, QuickHelpFlags nFlags) override;
-    virtual bool                UpdatePopover(void* nId, const OUString& rHelpText, const tools::Rectangle& rHelpArea) override;
+    virtual void*               ShowPopover(const OUString& rHelpText, vcl::Window* pParent, const tools::Rectangle& rHelpArea, QuickHelpFlags nFlags) override;
+    virtual bool                UpdatePopover(void* nId, const OUString& rHelpText, vcl::Window* pParent, const tools::Rectangle& rHelpArea) override;
     virtual bool                HidePopover(void* nId) override;
     virtual weld::Window*       GetFrameWeld() const override;
 #endif

vcl/source/app/help.cxx

@@ -198,7 +198,7 @@ void Help::HideBalloonAndQuickHelp()
 void* Help::ShowPopover(vcl::Window* pParent, const tools::Rectangle& rScreenRect,
                               const OUString& rText, QuickHelpFlags nStyle)
 {
-    void* nId = pParent->ImplGetFrame()->ShowPopover(rText, rScreenRect, nStyle);
+    void* nId = pParent->ImplGetFrame()->ShowPopover(rText, pParent, rScreenRect, nStyle);
     if (nId)
     {
         //popovers are handled natively, return early
@@ -218,7 +218,7 @@ void* Help::ShowPopover(vcl::Window* pParent, const tools::Rectangle& rScreenRec
 void Help::UpdatePopover(void* nId, vcl::Window* pParent, const tools::Rectangle& rScreenRect,
                          const OUString& rText)
 {
-    if (pParent->ImplGetFrame()->UpdatePopover(nId, rText, rScreenRect))
+    if (pParent->ImplGetFrame()->UpdatePopover(nId, rText, pParent, rScreenRect))
     {
         //popovers are handled natively, return early
         return;

vcl/unx/gtk3/gtk3gtkframe.cxx

@@ -2497,10 +2497,10 @@ bool GtkSalFrame::ShowTooltip(const OUString& rHelpText, const tools::Rectangle&
 
 namespace
 {
-    void set_pointing_to(GtkPopover *pPopOver, const tools::Rectangle& rHelpArea, const SalFrameGeometry& rGeometry)
+    void set_pointing_to(GtkPopover *pPopOver, vcl::Window* pParent, const tools::Rectangle& rHelpArea, const SalFrameGeometry& rGeometry)
     {
         GdkRectangle aRect;
-        aRect.x = rHelpArea.Left();
+        aRect.x = FloatingWindow::ImplConvertToAbsPos(pParent, rHelpArea).Left() - rGeometry.nX;
         aRect.y = rHelpArea.Top();
         aRect.width = 1;
         aRect.height = 1;
@@ -2518,14 +2518,11 @@ namespace
                 break;
         }
 
-        if (AllSettings::GetLayoutRTL())
-            aRect.x = rGeometry.nWidth-aRect.width-1-aRect.x;
-
         gtk_popover_set_pointing_to(pPopOver, &aRect);
     }
 }
 
-void* GtkSalFrame::ShowPopover(const OUString& rHelpText, const tools::Rectangle& rHelpArea, QuickHelpFlags nFlags)
+void* GtkSalFrame::ShowPopover(const OUString& rHelpText, vcl::Window* pParent, const tools::Rectangle& rHelpArea, QuickHelpFlags nFlags)
 {
     GtkWidget *pWidget = gtk_popover_new(getMouseEventWidget());
     OString sUTF = OUStringToOString(rHelpText, RTL_TEXTENCODING_UTF8);
@@ -2541,7 +2538,7 @@ void* GtkSalFrame::ShowPopover(const OUString& rHelpText, const tools::Rectangle
     else if (nFlags & QuickHelpFlags::Right)
         gtk_popover_set_position(GTK_POPOVER(pWidget), GTK_POS_LEFT);
 
-    set_pointing_to(GTK_POPOVER(pWidget), rHelpArea, maGeometry);
+    set_pointing_to(GTK_POPOVER(pWidget), pParent, rHelpArea, maGeometry);
 
     gtk_popover_set_modal(GTK_POPOVER(pWidget), false);
 
@@ -2550,11 +2547,11 @@ void* GtkSalFrame::ShowPopover(const OUString& rHelpText, const tools::Rectangle
     return pWidget;
 }
 
-bool GtkSalFrame::UpdatePopover(void* nId, const OUString& rHelpText, const tools::Rectangle& rHelpArea)
+bool GtkSalFrame::UpdatePopover(void* nId, const OUString& rHelpText, vcl::Window* pParent, const tools::Rectangle& rHelpArea)
 {
     GtkWidget *pWidget = static_cast<GtkWidget*>(nId);
 
-    set_pointing_to(GTK_POPOVER(pWidget), rHelpArea, maGeometry);
+    set_pointing_to(GTK_POPOVER(pWidget), pParent, rHelpArea, maGeometry);
 
     GtkWidget *pLabel = gtk_bin_get_child(GTK_BIN(pWidget));
     OString sUTF = OUStringToOString(rHelpText, RTL_TEXTENCODING_UTF8);