[gnome-builder] symbol layout stack: check for resolver to be loaded

[Sébastien Lafargue <slafargue src gnome org>]

commit 0f4d4de488c7f457c9b07b34752cc742ebc69164
Author: Sebastien Lafargue <slafargue gnome org>
Date:   Tue Jul 25 00:09:22 2017 +0200

    symbol layout stack: check for resolver to be loaded
    
    Some providers are loaded too late for the stack
    to show the tree ( for example the xml provider
    loaded the last because of its name starting with a X)

 .../symbol-tree/gbp-symbol-layout-stack-addin.c    |   35 ++++++++++++++++++-
 1 files changed, 33 insertions(+), 2 deletions(-)
---
diff --git a/plugins/symbol-tree/gbp-symbol-layout-stack-addin.c 
b/plugins/symbol-tree/gbp-symbol-layout-stack-addin.c
index b781ea7..17df8ca 100644
--- a/plugins/symbol-tree/gbp-symbol-layout-stack-addin.c
+++ b/plugins/symbol-tree/gbp-symbol-layout-stack-addin.c
@@ -34,6 +34,8 @@ struct _GbpSymbolLayoutStackAddin {
   DzlSignalGroup      *buffer_signals;
 
   guint                cursor_moved_handler;
+
+  guint                resolver_loaded : 1;
 };
 
 static void
@@ -170,6 +172,7 @@ gbp_symbol_layout_stack_addin_update_tree (GbpSymbolLayoutStackAddin *self,
   g_clear_object (&self->cancellable);
 
   symbol_resolver = ide_buffer_get_symbol_resolver (buffer);
+
   g_assert (!symbol_resolver || IDE_IS_SYMBOL_RESOLVER (symbol_resolver));
 
   gtk_widget_set_visible (GTK_WIDGET (self->button), symbol_resolver != NULL);
@@ -234,9 +237,13 @@ gbp_symbol_layout_stack_addin_bind (GbpSymbolLayoutStackAddin *self,
 
   gbp_symbol_menu_button_set_symbol (self->button, NULL);
 
-  symbol_resolver = ide_buffer_get_symbol_resolver (buffer);
-  gtk_widget_set_visible (GTK_WIDGET (self->button), symbol_resolver != NULL);
+  if (self->resolver_loaded)
+    return;
+
+  if (NULL != (symbol_resolver = ide_buffer_get_symbol_resolver (buffer)))
+    self->resolver_loaded = TRUE;
 
+  gtk_widget_set_visible (GTK_WIDGET (self->button), symbol_resolver != NULL);
   gbp_symbol_layout_stack_addin_update_tree (self, buffer);
 }
 
@@ -256,6 +263,26 @@ gbp_symbol_layout_stack_addin_unbind (GbpSymbolLayoutStackAddin *self,
   g_clear_object (&self->scope_cancellable);
 
   gtk_widget_hide (GTK_WIDGET (self->button));
+  self->resolver_loaded = FALSE;
+}
+
+static void
+gbp_symbol_layout_stack_addin_symbol_resolver_loaded (GbpSymbolLayoutStackAddin *self,
+                                                      IdeBuffer                 *buffer)
+{
+  IdeSymbolResolver *symbol_resolver;
+
+  g_assert (GBP_IS_SYMBOL_LAYOUT_STACK_ADDIN (self));
+  g_assert (IDE_IS_BUFFER (buffer));
+
+  if (self->resolver_loaded)
+    return;
+
+  symbol_resolver = ide_buffer_get_symbol_resolver (buffer);
+  gtk_widget_set_visible (GTK_WIDGET (self->button), symbol_resolver != NULL);
+  self->resolver_loaded = TRUE;
+
+  gbp_symbol_layout_stack_addin_update_tree (self, buffer);
 }
 
 static void
@@ -305,6 +332,10 @@ gbp_symbol_layout_stack_addin_load (IdeLayoutStackAddin *addin,
                                     "change-settled",
                                     G_CALLBACK (gbp_symbol_layout_stack_addin_change_settled),
                                     self);
+  dzl_signal_group_connect_swapped (self->buffer_signals,
+                                    "symbol-resolver-loaded",
+                                    G_CALLBACK (gbp_symbol_layout_stack_addin_symbol_resolver_loaded),
+                                    self);
 }
 
 static void