[glade] Utils: ignore text nodes in prev/next functions with comments

[Juan Pablo Ugarte <jpu src gnome org>]

commit 34fd642a0591bfa4b2cb32151b88569d86a48e69
Author: Juan Pablo Ugarte <juanpablougarte gmail com>
Date:   Sat Jul 18 13:41:16 2020 -0300

    Utils: ignore text nodes in prev/next functions with comments
    
    Ignore text nodes (whitespaces) in glade_xml_node_prev_with_comments() and
    glade_xml_node_next_with_comments() functions to make it easier to get
    comments nodes.

 gladeui/glade-xml-utils.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)
---
diff --git a/gladeui/glade-xml-utils.c b/gladeui/glade-xml-utils.c
index 16b438b4..219b60a9 100644
--- a/gladeui/glade-xml-utils.c
+++ b/gladeui/glade-xml-utils.c
@@ -857,6 +857,13 @@ glade_xml_node_is_comment (GladeXmlNode *node_in)
   return (node) ? node->type == XML_COMMENT_NODE : FALSE;
 }
 
+static inline gboolean
+glade_xml_node_is_text (GladeXmlNode *node_in)
+{
+  xmlNodePtr node = (xmlNodePtr) node_in;
+  return (node) ? node->type == XML_TEXT_NODE : FALSE;
+}
+
 static inline gboolean
 glade_xml_node_is_comment_or_text (GladeXmlNode *node_in)
 {
@@ -911,7 +918,11 @@ glade_xml_node_next_with_comments (GladeXmlNode *node_in)
 {
   xmlNodePtr node = (xmlNodePtr) node_in;
 
-  return (GladeXmlNode *) node->next;
+  node = node->next;
+  while (glade_xml_node_is_text ((GladeXmlNode *) node))
+    node = node->next;
+
+  return (GladeXmlNode *) node;
 }
 
 GladeXmlNode *
@@ -919,7 +930,11 @@ glade_xml_node_prev_with_comments (GladeXmlNode *node_in)
 {
   xmlNodePtr node = (xmlNodePtr) node_in;
 
-  return (GladeXmlNode *) node->prev;
+  node = node->prev;
+  while (glade_xml_node_is_text ((GladeXmlNode *) node))
+    node = node->prev;
+
+  return (GladeXmlNode *) node;
 }
 
 const gchar *