[geary] Clear the URL overlay when the selected conversation changes

[Robert Schroll <rschroll src gnome org>]

commit 32bda87fba14371e51d6e989d60ead87607597a7
Author: Robert Schroll <rschroll gmail com>
Date:   Wed Jun 4 14:45:58 2014 -0400

    Clear the URL overlay when the selected conversation changes
    
    https://bugzilla.gnome.org/show_bug.cgi?id=731225

 .../conversation-viewer/conversation-viewer.vala   |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/client/conversation-viewer/conversation-viewer.vala 
b/src/client/conversation-viewer/conversation-viewer.vala
index 613e73c..5ded86b 100644
--- a/src/client/conversation-viewer/conversation-viewer.vala
+++ b/src/client/conversation-viewer/conversation-viewer.vala
@@ -296,6 +296,8 @@ public class ConversationViewer : Gtk.Box {
     private void on_conversations_selected(Gee.Set<Geary.App.Conversation>? conversations,
         Geary.Folder? current_folder) {
         cancel_load();
+        // Clear the URL overlay
+        on_hovering_over_link(null, null);
         if (current_conversation != null) {
             current_conversation.appended.disconnect(on_conversation_appended);
             current_conversation.trimmed.disconnect(on_conversation_trimmed);