[latexila] Completion: add some comments

[Sébastien Wilmet <swilmet src gnome org>]

commit 15043e6bbb61432568e6ba9b81590bcb4ace43ef
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Tue Sep 2 18:08:22 2014 +0200

    Completion: add some comments

 src/completion.vala |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/src/completion.vala b/src/completion.vala
index dbb5b27..4902dbc 100644
--- a/src/completion.vala
+++ b/src/completion.vala
@@ -66,7 +66,7 @@ public class CompletionProvider : GLib.Object, SourceCompletionProvider
     // contains only environments that have extra info
     private Gee.HashMap<string, CompletionChoice?> _environments;
 
-    // while parsing, keep track of current command/argument/choice
+    // While parsing the XML file, keep track of current command/argument/choice.
     private CompletionCommand _current_command;
     private CompletionArgument _current_arg;
     private CompletionChoice _current_choice;
@@ -297,6 +297,9 @@ public class CompletionProvider : GLib.Object, SourceCompletionProvider
             return;
         }
 
+        // TODO this is a O(n) time complexity. This could be reduced to a O(log n) by
+        // using a GSequence for example, like it is done by the words completion provider
+        // in GtkSourceView.
         List<SourceCompletionItem> filtered_proposals = null;
         foreach (SourceCompletionItem item in proposals_to_filter)
         {