Update phrase display when patterns are created/destroyed.

canvas.C

@@ -856,6 +856,20 @@ Canvas::h_zoom ( float n )
     resize_grid();
 }
 
+void
+Canvas::v_zoom_fit ( void )
+{
+    if ( ! m.grid )
+        return;
+
+    changed_mapping();
+
+    m.vp->h = m.maxh;
+    m.vp->y = 0;
+
+    resize_grid();
+}
+
 /** adjust vertical zoom (* n) */
 void
 Canvas::v_zoom ( float n )

canvas.H

@@ -152,6 +152,7 @@ public:
     void pan ( int dir, int n );
     void h_zoom ( float n );
     void v_zoom ( float n );
+    void v_zoom_fit ( void );
     void notes ( char *s );
     char * notes ( void );
     void randomize_row ( int y );

main.C

@@ -152,6 +152,8 @@ main ( int argc, char **argv )
 
     init_song();
 
+    pattern::signal_create_destroy.connect( mem_fun( phrase_c,  &Canvas::v_zoom_fit ) );
+
     if ( ! lash.init( &argc, &argv ) )
         WARNING( "error initializing LASH" );