Assorted comment clarification in response to code review notes

source/blender/blenkernel/intern/anim_sys.c

@@ -1168,7 +1168,7 @@ static short animsys_write_rna_setting (PointerRNA *ptr, char *path, int array_i
 				 * for we know that which the updates in RNA were really just for
 				 * flushing property editing via UI/Py
 				 */
-				if (RNA_struct_is_a(new_ptr.type, &RNA_PoseBone)) {
+				if (new_ptr.type == &RNA_PoseBone) {
 					/* bone transforms - update pose (i.e. tag depsgraph) */
 					skip_updates_hack = 1;
 				}				

source/blender/blenkernel/intern/depsgraph.c

@@ -2062,8 +2062,19 @@ static short animdata_use_time(AnimData *adt)
 			return 1;
 	}
 	
-	/* experimental check: if we have drivers, more likely than not, on a frame change
+	/* If we have drivers, more likely than not, on a frame change
 	 * they'll need updating because their owner changed
+	 * 
+	 * This is kindof a hack to get around a whole host of problems
+	 * involving drivers using non-object datablock data (which the 
+	 * depsgraph currently has no way of representing let alone correctly
+	 * dependency sort+tagging). By doing this, at least we ensure that 
+	 * some commonly attempted drivers (such as scene -> current frame;
+	 * see "Driver updates fail" thread on Bf-committers dated July 2)
+	 * will work correctly, and that other non-object datablocks will have
+	 * their drivers update at least on frame change.
+	 *
+	 * -- Aligorith, July 4 2011
 	 */
 	if (adt->drivers.first)
 		return 1;

source/blender/editors/animation/drivers.c

@@ -383,7 +383,6 @@ short ANIM_paste_driver (ReportList *reports, ID *id, const char rna_path[], int
 			/* modifiers */
 		copy_fmodifiers(&fcu->modifiers, &channeldriver_copypaste_buf->modifiers);
 		
-			/* flags - on a per-relevant-flag basis */
 			/* extrapolation mode */
 		fcu->extend= channeldriver_copypaste_buf->extend;
 			

source/blender/editors/space_nla/nla_draw.c

@@ -471,10 +471,7 @@ static void nla_draw_strip_text (AnimData *adt, NlaTrack *nlt, NlaStrip *strip,
 		sprintf(str, "%d) Temp-Meta", index);
 	}
 	else {
-		if (strip->flag & NLASTRIP_FLAG_REVERSE)
-			sprintf(str, "%s", strip->name);
-		else
-			sprintf(str, "%s", strip->name);
+		sprintf(str, strip->name);
 	}
 	
 	/* set text color - if colors (see above) are light, draw black text, otherwise draw white */