return by unique_ptr from weld_parent

Change-Id: I3582b3000330fab96f6abef0f412b648b0573af4
Reviewed-on: https://gerrit.libreoffice.org/69793
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

include/vcl/weld.hxx

@@ -211,7 +211,7 @@ public:
     virtual void freeze() = 0;
     virtual void thaw() = 0;
 
-    virtual Container* weld_parent() const = 0;
+    virtual std::unique_ptr<Container> weld_parent() const = 0;
 
     //iterate upwards through the hierarchy starting at this widgets parent,
     //calling func with their helpid until func returns true or we run out of

sfx2/source/appl/sfxhelp.cxx

@@ -649,7 +649,7 @@ OUString SfxHelp::GetHelpText(const OUString& aCommandURL, const weld::Widget* p
             if (!sHelpText.isEmpty())
                 xParent.reset();
             else
-                xParent.reset(xParent->weld_parent());
+                xParent = xParent->weld_parent();
         }
 
         if (bIsDebug && sHelpText.isEmpty())

vcl/source/app/salvtables.cxx

@@ -593,7 +593,7 @@ public:
         m_xWidget->SetUpdateMode(true);
     }
 
-    virtual weld::Container* weld_parent() const override;
+    virtual std::unique_ptr<weld::Container> weld_parent() const override;
 
     virtual ~SalInstanceWidget() override
     {
@@ -832,10 +832,12 @@ public:
     }
 };
 
-weld::Container* SalInstanceWidget::weld_parent() const
+std::unique_ptr<weld::Container> SalInstanceWidget::weld_parent() const
 {
     vcl::Window* pParent = m_xWidget->GetParent();
-    return pParent ? new SalInstanceContainer(pParent, m_pBuilder, false) : nullptr;
+    if (!pParent)
+        return nullptr;
+    return std::make_unique<SalInstanceContainer>(pParent, m_pBuilder, false);
 }
 
 class SalInstanceWindow : public SalInstanceContainer, public virtual weld::Window
@@ -4686,7 +4688,7 @@ namespace weld
         if (!rRelocateId.isEmpty())
         {
             m_xRelocate = m_xBuilder->weld_container(rRelocateId);
-            m_xOrigParent.reset(m_xRelocate->weld_parent());
+            m_xOrigParent = m_xRelocate->weld_parent();
             //fdo#75121, a bit tricky because the widgets we want to align with
             //don't actually exist in the ui description, they're implied
             m_xOrigParent->move(m_xRelocate.get(), m_xContentArea.get());

vcl/unx/gtk3/gtk3gtkinst.cxx

@@ -1809,7 +1809,7 @@ public:
         return OUString(pStr, pStr ? strlen(pStr) : 0, RTL_TEXTENCODING_UTF8);
     }
 
-    virtual weld::Container* weld_parent() const override;
+    virtual std::unique_ptr<weld::Container> weld_parent() const override;
 
     virtual OString get_buildable_name() const override
     {
@@ -2368,10 +2368,12 @@ public:
     }
 };
 
-weld::Container* GtkInstanceWidget::weld_parent() const
+std::unique_ptr<weld::Container> GtkInstanceWidget::weld_parent() const
 {
     GtkWidget* pParent = gtk_widget_get_parent(m_pWidget);
-    return pParent ? new GtkInstanceContainer(GTK_CONTAINER(pParent), m_pBuilder, false) : nullptr;
+    if (!pParent)
+        return nullptr;
+    return std::make_unique<GtkInstanceContainer>(GTK_CONTAINER(pParent), m_pBuilder, false);
 }
 
 class GtkInstanceWindow : public GtkInstanceContainer, public virtual weld::Window