[gnome-builder] ctags: allow _ as valid completion character

[Christian Hergert <chergert src gnome org>]

commit 75494ae8f7a1eb29d736893e510e8422b15a2aee
Author: Christian Hergert <chergert redhat com>
Date:   Wed Nov 23 15:37:23 2016 -0800

    ctags: allow _ as valid completion character
    
    This fixes the issue where the completion window disappears as you type
    because the current character does not match the allowed completion
    characters.

 plugins/ctags/ide-ctags-completion-provider.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/plugins/ctags/ide-ctags-completion-provider.c b/plugins/ctags/ide-ctags-completion-provider.c
index 09a5b53..75a4909 100644
--- a/plugins/ctags/ide-ctags-completion-provider.c
+++ b/plugins/ctags/ide-ctags-completion-provider.c
@@ -295,7 +295,7 @@ ide_ctags_completion_provider_match (GtkSourceCompletionProvider *provider,
 
       ch = gtk_text_iter_get_char (&iter);
 
-      if (!g_unichar_isalnum (ch))
+      if (!g_unichar_isalnum (ch) && ch != '_')
         return FALSE;
     }