At the moment most Creator keyboard shortcuts are created with Qt::ApplicationShortcut ShortcutContext. Since most of Creator is in a single window interface, this doesn't really matter much. However muxcons (http://muxcons.sf.net) opens a separate window for talking to fshell, and has its own shortcuts, so it suddenly matters to get the contexts right. Because the ActionManager creates all its shortcuts with Qt::ApplicationShortcut context, muxcons is unable to for example use Ctrl-Tab to switch between fshell tabs - pressing Ctrl-Tab while the muxcons window is frontmost still pops up the editor file switch dialog.

I've tested the following change:

diff --git a/src/plugins/coreplugin/actionmanager/actionmanager.cpp b/src/plugins/coreplugin/actionmanager/actionmanager
index 48c46a8..ddd6a9c 100644
--- a/src/plugins/coreplugin/actionmanager/actionmanager.cpp
+++ b/src/plugins/coreplugin/actionmanager/actionmanager.cpp
@@ -371,7 +371,7 @@ Action *ActionManagerPrivate::overridableAction(const Id &id)
         m_idCmdMap.insert(uid, a);
         m_mainWnd->addAction(a->action());
         a->action()->setObjectName(id);
-        a->action()->setShortcutContext(Qt::ApplicationShortcut);
+        a->action()->setShortcutContext(Qt::WindowShortcut);
         a->setCurrentContext(m_context);
     }

Which seems to fix ctrl-tab and all the other shortcut keys that muxcons uses, and doesn't cause any problems for the rest of the UI as far as I can see.