Disable Ubuntu's global menu bar for Aegisub

wxWidgets currently doesn't generate menu open or update events for the
Ubuntu menubar (since GTK doesn't send the relevant signals to the
application), which we rely on.

Updates #1531.

aegisub/src/main.cpp

@@ -132,6 +132,11 @@ void AegisubApp::OnAssertFailure(const wxChar *file, int line, const wxChar *fun
 	wxApp::OnAssertFailure(file, line, func, cond, msg);
 }
 
+AegisubApp::AegisubApp() {
+	// http://trac.wxwidgets.org/ticket/14302
+	wxSetEnv("UBUNTU_MENUPROXY", "0");
+}
+
 /// @brief Gets called when application starts.
 /// @return bool
 bool AegisubApp::OnInit() {

aegisub/src/main.h

@@ -34,7 +34,6 @@
 /// @ingroup main
 ///
 
-
 #ifndef AGI_PRE
 #include <wx/app.h>
 #include <wx/file.h>
@@ -113,6 +112,8 @@ class AegisubApp: public wxApp {
 	void HandleEvent(wxEvtHandler *handler, wxEventFunction func, wxEvent& event) const;
 
 public:
+	AegisubApp();
+
 	/// DOCME
 	AegisubLocale locale;