Handle updating tooltip text in wxCompositeWindow correctly.

While calling SetToolTip(wxToolTip*) overload already worked correctly for
wxCompositeWindow, using SetToolTip(wxString) did not if a tooltip already
existed, as it didn't use the virtual DoSetToolTip() in this case, resulting
in e.g. impossibility to update wxSpinCtrlDouble tooltip using this method.

Fix this by introducing DoSetToolTipText() virtual which is used by that
overload now and overriding it in wxCompositeWindow.

Also don't override DoSetToolTip() in wxSpinCtrlGenericBase any more, it is
not necessary as it's already done by its base class wxCompositeWindow.

Closes #16595.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78245 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/spinctlg.cpp

@@ -350,32 +350,6 @@ bool wxSpinCtrlGenericBase::Show(bool show)
     return true;
 }
 
-#if wxUSE_TOOLTIPS
-void wxSpinCtrlGenericBase::DoSetToolTip(wxToolTip *tip)
-{
-    // Notice that we must check for the subcontrols not being NULL (as they
-    // could be if we were created with the default ctor and this is called
-    // before Create() for some reason) and that we can't call SetToolTip(tip)
-    // because this would take ownership of the wxToolTip object (twice).
-    if ( m_textCtrl )
-    {
-        if ( tip )
-            m_textCtrl->SetToolTip(tip->GetTip());
-        else
-            m_textCtrl->SetToolTip(NULL);
-    }
-
-    if ( m_spinButton )
-    {
-        if( tip )
-            m_spinButton->SetToolTip(tip->GetTip());
-        else
-            m_spinButton->SetToolTip(NULL);
-    }
-
-    wxWindowBase::DoSetToolTip(tip);
-}
-#endif // wxUSE_TOOLTIPS
 
 bool wxSpinCtrlGenericBase::SetBackgroundColour(const wxColour& colour)
 {