Use wxFont::Bold() in wxGenericTreeCtrl instead of wrongly duplicating it.

Creating a new wxFont from the components of the existing one doesn't always
work because we may not have a valid value for the old font family so attempt
to use it as a family of the new font results in an assert.

Just use wxFont::Bold() instead to avoid the problem. It's much shorter and
obviously correct and doesn't result in asserts.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64649 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/treectlg.cpp

@@ -977,13 +977,7 @@ void wxGenericTreeCtrl::Init()
 #else
     m_normalFont = wxSystemSettings::GetFont( wxSYS_DEFAULT_GUI_FONT );
 #endif
-    m_boldFont = wxFont(m_normalFont.GetPointSize(),
-                        m_normalFont.GetFamily(),
-                        m_normalFont.GetStyle(),
-                        wxBOLD,
-                        m_normalFont.GetUnderlined(),
-                        m_normalFont.GetFaceName(),
-                        m_normalFont.GetEncoding());
+    m_boldFont = m_normalFont.Bold();
 }
 
 bool wxGenericTreeCtrl::Create(wxWindow *parent,
@@ -1298,14 +1292,8 @@ bool wxGenericTreeCtrl::SetFont( const wxFont &font )
 {
     wxTreeCtrlBase::SetFont(font);
 
-    m_normalFont = font ;
-    m_boldFont = wxFont(m_normalFont.GetPointSize(),
-                        m_normalFont.GetFamily(),
-                        m_normalFont.GetStyle(),
-                        wxBOLD,
-                        m_normalFont.GetUnderlined(),
-                        m_normalFont.GetFaceName(),
-                        m_normalFont.GetEncoding());
+    m_normalFont = font;
+    m_boldFont = m_normalFont.Bold();
 
     if (m_anchor)
         m_anchor->RecursiveResetTextSize();