Add tracing to key event handling functions

No real changes, just make it simpler to understand what's going in
wxOSX code when handling key events by sprinkling it with wxLogTrace
calls.

src/osx/window_osx.cpp

@@ -71,6 +71,8 @@
 
 #include <string.h>
 
+#define TRACE_KEYS  "keyevent"
+
 #ifdef __WXUNIVERSAL__
     wxIMPLEMENT_ABSTRACT_CLASS(wxWindowMac, wxWindowBase);
 #endif
@@ -177,6 +179,27 @@ wxIMPLEMENT_DYNAMIC_CLASS(wxBlindPlateWindow, wxWindow);
 wxBEGIN_EVENT_TABLE(wxBlindPlateWindow, wxWindow)
 wxEND_EVENT_TABLE()
 
+// ----------------------------------------------------------------------------
+// debug helpers
+// ----------------------------------------------------------------------------
+
+// Function used to dump a brief description of a window.
+extern
+wxString wxDumpWindow(wxWindowMac* win)
+{
+    if ( !win )
+        return "(no window)";
+
+    wxString s = wxString::Format("%s(%p",
+                                  win->GetClassInfo()->GetClassName(), win);
+
+    wxString label = win->GetLabel();
+    if ( !label.empty() )
+        s += wxString::Format(", \"%s\"", label);
+    s += ")";
+
+    return s;
+}
 
 // ----------------------------------------------------------------------------
  // constructors and such
@@ -2570,6 +2593,18 @@ bool wxWindowMac::UnregisterHotKey(int hotkeyId)
 
 bool wxWindowMac::OSXHandleKeyEvent( wxKeyEvent& event )
 {
+    wxLogTrace(TRACE_KEYS, "Handling %s event in %s",
+               event.GetEventType() == wxEVT_KEY_DOWN
+                ? "key down"
+                : event.GetEventType() == wxEVT_CHAR
+                    ? "char"
+                    : event.GetEventType() == wxEVT_KEY_UP
+                        ? "key up"
+                        : event.GetEventType() == wxEVT_CHAR_HOOK
+                            ? "char hook"
+                            : "unknown",
+               wxDumpWindow(this));
+
     bool handled = false;
 
     // moved the ordinary key event sending AFTER the accel evaluation