3 files changed, 5 insertions, 25 deletions
diff --git a/tree/debug.c b/tree/debug.c
index e468ef27..b03d4e28 100644
--- a/tree/debug.c
+++ b/tree/debug.c
@@ -141,8 +141,9 @@ static void lisptext(fz_textnode *node, int level)
 
 static void lispimage(fz_imagenode *node, int level)
 {
+	fz_image *image = node->image;
 	indent(level);
-	printf("(image)\n");
+	printf("(image %dx%d %d+%d)\n", image->w, image->h, image->n, image->a);
 }
 
 static void lispshade(fz_shadenode *node, int level)
diff --git a/tree/optimize.c b/tree/optimize.c
index 9f85cdd7..629796e2 100644
--- a/tree/optimize.c
+++ b/tree/optimize.c
@@ -267,11 +267,11 @@ static fz_error *clean1x1(fz_node *node)
 					if (error)
 						return error;
 
-					fz_insertnodeafter(mask, (fz_node*)rect);
-					fz_insertnodeafter(mask, color);
 					fz_insertnodeafter(current, mask);
+					fz_insertnodelast(mask, (fz_node*)rect);
+					fz_insertnodelast(mask, color);
 					fz_removenode(current);
-					current = color;
+					current = mask;
 				}
 
 				else
diff --git a/tree/tree.c b/tree/tree.c
index f667e39a..f6874711 100644
--- a/tree/tree.c
+++ b/tree/tree.c
@@ -45,12 +45,6 @@ fz_boundtree(fz_tree *tree, fz_matrix ctm)
 void
 fz_insertnodefirst(fz_node *parent, fz_node *child)
 {
-	assert(fz_istransformnode(parent) ||
-		fz_isovernode(parent) ||
-		fz_ismasknode(parent) ||
-		fz_isblendnode(parent) ||
-		fz_ismetanode(parent));
-
 	child->parent = parent;
 	child->next = parent->first;
 	parent->first = child;
@@ -61,12 +55,6 @@ fz_insertnodefirst(fz_node *parent, fz_node *child)
 void
 fz_insertnodelast(fz_node *parent, fz_node *child)
 {
-	assert(fz_istransformnode(parent) ||
-		fz_isovernode(parent) ||
-		fz_ismasknode(parent) ||
-		fz_isblendnode(parent) ||
-		fz_ismetanode(parent));
-
 	child->parent = parent;
 	if (!parent->first)
 		parent->first = child;
@@ -79,18 +67,9 @@ void
 fz_insertnodeafter(fz_node *prev, fz_node *child)
 {
 	fz_node *parent = prev->parent;
-
-	assert(fz_istransformnode(parent) ||
-		fz_isovernode(parent) ||
-		fz_ismasknode(parent) ||
-		fz_isblendnode(parent) ||
-		fz_ismetanode(parent));
-
 	child->parent = parent;
-
 	if (parent->last == prev)
 		parent->last = child;
-
 	child->next = prev->next;
 	prev->next = child;
 }