Add wxTextEntry::ClickDefaultButtonIfPossible() to wxMSW

Factor out this function from wxTextCtrl to allow its reuse in
wxComboBox in the upcoming commit.

No real changes, this is a pure refactoring.

include/wx/msw/textentry.h

@@ -81,6 +81,10 @@ protected:
     virtual bool DoAutoCompleteCustom(wxTextCompleter *completer) wxOVERRIDE;
 #endif // wxUSE_OLE
 
+    // Helper for wxTE_PROCESS_ENTER handling: activates the default button in
+    // the dialog containing this control if any.
+    bool ClickDefaultButtonIfPossible();
+
 private:
     // implement this to return the HWND of the EDIT control
     virtual WXHWND GetEditHWND() const = 0;

src/msw/textctrl.cpp

@@ -2191,10 +2191,9 @@ wxTextCtrl::MSWHandleMessage(WXLRESULT *rc,
     if ( nMsg == WM_CHAR &&
             !processed &&
             HasFlag(wxTE_PROCESS_ENTER) &&
-            wParam == VK_RETURN &&
+            wParam == VK_RETURN )
-            !wxIsAnyModifierDown() )
     {
-        MSWClickButtonIfPossible(MSWGetDefaultButtonFor(this));
+        ClickDefaultButtonIfPossible();
 
         processed = true;
     }

src/msw/textentry.cpp

@@ -1036,4 +1036,15 @@ wxPoint wxTextEntry::DoGetMargins() const
     return wxPoint(left, top);
 }
 
+// ----------------------------------------------------------------------------
+// input handling
+// ----------------------------------------------------------------------------
+
+bool wxTextEntry::ClickDefaultButtonIfPossible()
+{
+    return !wxIsAnyModifierDown() &&
+                wxWindow::MSWClickButtonIfPossible(
+                    wxWindow::MSWGetDefaultButtonFor(GetEditableWindow()));
+}
+
 #endif // wxUSE_TEXTCTRL || wxUSE_COMBOBOX