track naming patch from brian; slightly modified F11-bug workaround from brian; undo/redo items in edit menu now show operation to be undone/redone; canvas allocations now handled by an idle handler; region views respond to changes in fade/in/out curves ; undo/redo possible for some fade in/out operations; automation tracks extend to max_frames

git-svn-id: svn://localhost/ardour2/trunk@1134 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/pbd/pbd/undo.h

@@ -74,7 +74,7 @@ class UndoTransaction : public Command
 	friend void command_death (UndoTransaction*, Command *);
 };
 
-class UndoHistory
+class UndoHistory : public sigc::trackable
 {
   public:
 	UndoHistory();
@@ -97,6 +97,8 @@ class UndoHistory
         XMLNode &get_state();
         void save_state();
 
+	sigc::signal<void> Changed;
+
   private:
 	bool _clearing;
 	std::list<UndoTransaction*> UndoList;

libs/pbd/undo.cc

@@ -157,6 +157,8 @@ UndoHistory::add (UndoTransaction* const ut)
 	UndoList.push_back (ut);
 
 	/* we are now owners of the transaction */
+
+	Changed (); /* EMIT SIGNAL */
 }
 
 void
@@ -168,6 +170,8 @@ UndoHistory::remove (UndoTransaction* const ut)
 
 	UndoList.remove (ut);
 	RedoList.remove (ut);
+
+	Changed (); /* EMIT SIGNAL */
 }
 
 void
@@ -182,6 +186,8 @@ UndoHistory::undo (unsigned int n)
 		ut->undo ();
 		RedoList.push_back (ut);
 	}
+
+	Changed (); /* EMIT SIGNAL */
 }
 
 void
@@ -196,6 +202,8 @@ UndoHistory::redo (unsigned int n)
 		ut->redo ();
 		UndoList.push_back (ut);
 	}
+
+	Changed (); /* EMIT SIGNAL */
 }
 
 void
@@ -204,6 +212,9 @@ UndoHistory::clear_redo ()
 	_clearing = true;
 	RedoList.clear ();
 	_clearing = false;
+
+	Changed (); /* EMIT SIGNAL */
+
 }
 
 void
@@ -212,6 +223,8 @@ UndoHistory::clear_undo ()
 	_clearing = true;
 	UndoList.clear ();
 	_clearing = false;
+
+	Changed (); /* EMIT SIGNAL */
 }
 
 void
@@ -219,6 +232,8 @@ UndoHistory::clear ()
 {
 	clear_undo ();
 	clear_redo ();
+
+	Changed (); /* EMIT SIGNAL */
 }
 
 XMLNode & UndoHistory::get_state()