2 files changed, 28 insertions, 14 deletions

diff --git a/generic/Tabular.c b/generic/Tabular.c
index 009576f..eed5c41 100644
--- a/generic/Tabular.c
+++ b/generic/Tabular.c
@@ -125,7 +125,7 @@ Init(Item		item,
   tab->connection_anchor = ZnAnchorSW;
   tab->pos.x = tab->pos.y = 0.0;
 
-  field_set->wi = wi;
+  field_set->item = item;
   field_set->label_format = NULL;
   
   /*
@@ -318,7 +318,7 @@ ToArea(Item	item,
 static void
 Draw(Item 	item)
 {
-  FIELD.DrawFields(&((TabularItem) item)->field_set, item);
+  FIELD.DrawFields(&((TabularItem) item)->field_set);
 }
 
 
@@ -332,7 +332,7 @@ Draw(Item 	item)
 static void
 Render(Item 	item)
 {
-  FIELD.RenderFields(&((TabularItem) item)->field_set, item);
+  FIELD.RenderFields(&((TabularItem) item)->field_set);
 }
 
 
@@ -579,7 +579,7 @@ Index(Item	item,
       int	*index)
 {
   return FIELD.FieldIndex(&((TabularItem) item)->field_set, field,
-			  item, index_spec, index);
+			  index_spec, index);
 }
 
 
@@ -596,7 +596,10 @@ InsertChars(Item	item,
 	    int		*index,
 	    char	*chars)
 {
-  FIELD.FieldInsertChars(&((TabularItem) item)->field_set, field, index, chars);
+  if (FIELD.FieldInsertChars(&((TabularItem) item)->field_set,
+			     field, index, chars)) {
+    ITEM.Invalidate(item, ZN_COORDS_FLAG);
+  }
 }
 
 
@@ -613,7 +616,10 @@ DeleteChars(Item	item,
 	    int		*first,
 	    int		*last)
 {
-  FIELD.FieldDeleteChars(&((TabularItem) item)->field_set, field, first, last);
+  if (FIELD.FieldDeleteChars(&((TabularItem) item)->field_set,
+			     field, first, last)) {
+    ITEM.Invalidate(item, ZN_COORDS_FLAG);
+  }
 }
 
 
diff --git a/generic/Track.c b/generic/Track.c
index e7ebc6b..14c3de2 100644
--- a/generic/Track.c
+++ b/generic/Track.c
@@ -415,7 +415,7 @@ Init(Item		item,
     track->speed_vector.x = 0.0;
     track->speed_vector.y = 10.0;
   }
-  field_set->wi = wi;
+  field_set->item = item;
   field_set->label_format = NULL;
   /*
    * Then try to see if some fields are needed.
@@ -1264,7 +1264,7 @@ Draw(Item	item)
   /*
    * Draw the label.
    */
-  FIELD.DrawFields(&track->field_set, item);
+  FIELD.DrawFields(&track->field_set);
 }
 
 
@@ -1525,7 +1525,7 @@ Render(Item	item)
   /*
    * Render the label.
    */
-  FIELD.RenderFields(&track->field_set, item);
+  FIELD.RenderFields(&track->field_set);
 #endif
 } 
 
@@ -2099,10 +2099,10 @@ Part(Item	item,
       *part_spec = Tcl_NewIntObj(*part);
     }
     else {
+      part_str = "";
       switch (*part) {
       default:
       case ZN_NO_PART:
-	part_str = "";
 	break;
       case CURRENT_POSITION:
 	part_str = "position";
@@ -2119,7 +2119,9 @@ Part(Item	item,
 	  break;
 	}
       }
-      *part_spec = NewStringObj(part_str);
+      if (part_str[0]) {
+	*part_spec = NewStringObj(part_str);
+      }
     }
   }
   return ZN_OK;  
@@ -2142,7 +2144,7 @@ Index(Item	item,
       int	*index)
 {
   return FIELD.FieldIndex(&((TrackItem) item)->field_set, field,
-			  item, index_spec, index);
+			  index_spec, index);
 }
 
 
@@ -2159,7 +2161,10 @@ InsertChars(Item	item,
 	    int		*index,
 	    char	*chars)
 {
-  FIELD.FieldInsertChars(&((TrackItem) item)->field_set, field, index, chars);
+  if (FIELD.FieldInsertChars(&((TrackItem) item)->field_set,
+			     field, index, chars)) {
+    ITEM.Invalidate(item, ZN_COORDS_FLAG);
+  }
 }
 
 
@@ -2176,7 +2181,10 @@ DeleteChars(Item	item,
 	    int		*first,
 	    int		*last)
 {
-  FIELD.FieldDeleteChars(&((TrackItem) item)->field_set, field, first, last);
+  if (FIELD.FieldDeleteChars(&((TrackItem) item)->field_set,
+			     field, first, last)) {
+    ITEM.Invalidate(item, ZN_COORDS_FLAG);
+  }
 }