Refactor repetitions into wxFileDialogBase::UpdateExtraControlUI()

No real changes, just prepare for the next commit before repeating more
code.

include/wx/filedlg.h

@@ -181,6 +181,9 @@ protected:
         { return m_extraControlCreator != NULL; }
     // get the size of the extra control by creating and deleting it
     wxSize GetExtraControlSize();
+    // Helper function for native file dialog usage where no wx events
+    // are processed.
+    void UpdateExtraControlUI();
 
 private:
     ExtraControlCreatorFunction m_extraControlCreator;

src/common/fldlgcmn.cpp

@@ -192,6 +192,12 @@ wxSize wxFileDialogBase::GetExtraControlSize()
     return (*m_extraControlCreator)(&dlg)->GetSize();
 }
 
+void wxFileDialogBase::UpdateExtraControlUI()
+{
+    if ( m_extraControl )
+        m_extraControl->UpdateWindowUI(wxUPDATE_UI_RECURSE);
+}
+
 void wxFileDialogBase::SetPath(const wxString& path)
 {
     wxString ext;

src/gtk/filedlg.cpp

@@ -496,8 +496,7 @@ void wxFileDialog::GTKSelectionChanged(const wxString& filename)
 {
     m_currentlySelectedFilename = filename;
 
-    if (m_extraControl)
-        m_extraControl->UpdateWindowUI(wxUPDATE_UI_RECURSE);
+    UpdateExtraControlUI();
 }
 
 #endif // wxUSE_FILEDLG

src/msw/filedlg.cpp

@@ -353,8 +353,7 @@ void wxFileDialog::MSWOnSelChange(WXHWND hDlg)
     else
         m_currentlySelectedFilename.clear();
 
-    if ( m_extraControl )
-        m_extraControl->UpdateWindowUI(wxUPDATE_UI_RECURSE);
+    UpdateExtraControlUI();
 }
 
 void wxFileDialog::MSWOnTypeChange(WXHWND WXUNUSED(hDlg), int nFilterIndex)
@@ -364,8 +363,7 @@ void wxFileDialog::MSWOnTypeChange(WXHWND WXUNUSED(hDlg), int nFilterIndex)
     // circumstances, so take care before decrementing it.
     m_currentlySelectedFilterIndex = nFilterIndex ? nFilterIndex - 1 : 0;
 
-    if ( m_extraControl )
-        m_extraControl->UpdateWindowUI(wxUPDATE_UI_RECURSE);
+    UpdateExtraControlUI();
 }
 
 // helper used below in ShowCommFileDialog(): style is used to determine