Add action to set range from region position and length.

Timeline/Audio_Region.C

@@ -265,6 +265,8 @@ Audio_Region::menu_cb ( const Fl_Menu_ *m )
         _loop = 0;
     else if ( ! strcmp( picked, "/Normalize" ) )
         normalize();
+    else if ( ! strcmp( picked, "/Range from" ) )
+        timeline->range( start(), length() );
     else if ( ! strcmp( picked, "/Remove" ) )
         remove();
     else
@@ -307,6 +309,7 @@ Audio_Region::menu ( void )
             { "Loop point to mouse", 'l', 0, 0 },
             { "Clear loop point", FL_SHIFT + 'l', 0, 0 },
             { "Normalize", 'n', 0, 0 },
+            { "Range from", FL_CTRL + 'r', 0, 0 },
             { "Remove", 0, 0, 0 },
             { 0 },
         };

Timeline/Timeline.C

@@ -173,6 +173,16 @@ Timeline::fix_range ( void )
     }
 }
 
+/** set the range to /start/ + /length/ */
+void
+Timeline::range ( nframes_t start, nframes_t length )
+{
+    p1 = start;
+    p2 = start + length;
+
+    redraw();
+}
+
 void
 Timeline::menu_cb ( Fl_Menu_ *m )
 {

Timeline/Timeline.H

@@ -144,7 +144,7 @@ public:
     void update_tempomap ( void );
 
     nframes_t fpp ( void ) const { return 1 << _fpp; }
-
+    void range ( nframes_t start, nframes_t length );
     nframes_t length ( void ) const;
     void sample_rate ( nframes_t r ) { _sample_rate = r; }
     nframes_t sample_rate ( void ) const { return _sample_rate; }