Modify region trim cursor if a region can only be trimmed in one direction.

git-svn-id: svn://localhost/ardour2/branches/3.0@8045 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/ardour/ardour/trimmable.h

@@ -9,14 +9,14 @@ class Trimmable {
         virtual ~Trimmable() {}
 
         enum CanTrim { 
-                FrontTrimEarlier,
-                FrontTrimLater,
-                EndTrimEarlier,
-                EndTrimLater,
-                TopTrimUp,
-                TopTrimDown,
-                BottomTrimUp,
-                BottomTrimDown
+                FrontTrimEarlier = 0x1,
+                FrontTrimLater = 0x2,
+                EndTrimEarlier = 0x4,
+                EndTrimLater = 0x8,
+                TopTrimUp = 0x10,
+                TopTrimDown = 0x20,
+                BottomTrimUp = 0x40,
+                BottomTrimDown = 0x80
         } ;
 
         virtual CanTrim can_trim() const { 

libs/ardour/region.cc

@@ -1607,7 +1607,7 @@ Region::can_trim () const
         }
 
         if (!_sources.empty()) {
-                if (last_frame() < _sources.front()->length (0)) {
+                if ((start() + length()) < _sources.front()->length (0)) {
                         ct = CanTrim (ct | EndTrimLater);
                 }
         }