[gnome-builder] project-tree: remove empty node when inserting new child

[Christian Hergert <chergert src gnome org>]

commit 92698699709300466c255ee81f7480a98e1c7970
Author: Christian Hergert <chergert redhat com>
Date:   Wed Feb 6 15:25:23 2019 -0800

    project-tree: remove empty node when inserting new child
    
    Fixes #800

 src/plugins/project-tree/gbp-project-tree-addin.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
---
diff --git a/src/plugins/project-tree/gbp-project-tree-addin.c 
b/src/plugins/project-tree/gbp-project-tree-addin.c
index 2c20dd9a3..b7d22d695 100644
--- a/src/plugins/project-tree/gbp-project-tree-addin.c
+++ b/src/plugins/project-tree/gbp-project-tree-addin.c
@@ -425,9 +425,17 @@ gbp_project_tree_addin_add_file (GbpProjectTreeAddin *self,
 
       if ((parent = find_file_node (self->tree, item)))
         {
+          IdeTreeNode *child;
+
           if (!ide_tree_node_expanded (self->tree, parent))
             IDE_EXIT;
 
+          /* Remove empty children if necessary */
+          if (ide_tree_node_get_n_children (parent) == 1 &&
+              (child = ide_tree_node_get_nth_child (parent, 0)) &&
+              ide_tree_node_is_empty (child))
+            ide_tree_node_remove (parent, child);
+
           continue;
         }
 
@@ -446,6 +454,9 @@ gbp_project_tree_addin_add_file (GbpProjectTreeAddin *self,
       node = create_file_node (project_file);
 
       ide_tree_node_insert_sorted (parent, node, node_compare);
+
+      if (!ide_tree_node_expanded (self->tree, parent))
+        ide_tree_expand_node (self->tree, parent);
     }
 
   IDE_EXIT;