[LyX/master] Fix #8657 on Linux.

[Juergen Spitzmueller]

commit 5c1731b060c82da96d27d9a0dfb1b3997f1903be
Author: Juergen Spitzmueller <sp...@lyx.org>
Date:   Sun Feb 23 13:33:04 2014 +0100

    Fix #8657 on Linux.
    
    On windows, there is apparently some more work to do.

diff --git a/src/frontends/qt4/GuiApplication.cpp 
b/src/frontends/qt4/GuiApplication.cpp
index f32c746..fc627a6 100644
--- a/src/frontends/qt4/GuiApplication.cpp
+++ b/src/frontends/qt4/GuiApplication.cpp
@@ -851,8 +851,12 @@ public:
                case QEvent::Show:
                case QEvent::Hide:
                case QEvent::Resize:
+               case QEvent::UpdateRequest:
+               case QEvent::CursorChange:
+               case QEvent::ActionChanged:
                        return QObject::eventFilter(obj, event);
                default:
+                       // FIXME Blocking all these events is a bad idea.
                        QKeyEvent *keyEvent = dynamic_cast<QKeyEvent*>(event);
                        if (keyEvent && keyEvent->key() == Qt::Key_Escape)
                                pressed_ = true;