-fix bug in animation editor

-fix crash bug in physics motion, closes #1993

demos/2d/motion/engine.cfg

@@ -2,3 +2,10 @@
 
 name="Motion Test"
 main_scene="res://motion.scn"
+
+[display]
+
+width=800
+height=600
+stretch_mode="2d"
+stretch_aspect="keep"

servers/physics_2d/physics_2d_server_wrap_mt.h

@@ -224,7 +224,7 @@ public:
 	bool body_test_motion(RID p_body,const Vector2& p_motion,float p_margin=0.001,MotionResult *r_result=NULL) {
 
 		ERR_FAIL_COND_V(main_thread!=Thread::get_caller_ID(),false);
-		return body_test_motion(p_body,p_motion,p_margin,r_result);
+		return physics_2d_server->body_test_motion(p_body,p_motion,p_margin,r_result);
 	}
 
 	/* JOINT API */

tools/editor/animation_editor.cpp

@@ -1327,8 +1327,16 @@ void AnimationKeyEditor::_track_editor_draw() {
 			float time = animation->track_get_key_time(idx,i);
 			if (time<keys_from)
 				continue;
-			if (time>keys_to)
+			if (time>keys_to) {
+
+				if (first && i>0 && animation->track_get_key_value(idx,i)==animation->track_get_key_value(idx,i-1)) {
+					//draw whole line
+					te->draw_line(ofs+Vector2(name_limit,y+h/2),ofs+Point2(settings_limit,y+h/2),color);
+				}
+
 				break;
+			}
+
 			float x =  key_hofs + name_limit + (time-keys_from)*zoom_scale;
 
 			Ref<Texture> tex = type_icon[tt];