[gnome-builder] update-manager: Make sure there's only one update notification

[Christian Hergert <chergert src gnome org>]

commit 1bfb061ae0904259fd0789a6541a9f3c09ca18b1
Author: vanadiae <vanadiae35 gmail com>
Date:   Sun Feb 21 15:09:27 2021 +0100

    update-manager: Make sure there's only one update notification
    
    Currently when running Builder nightly there's frequently updates, so
    during a full day it might happen that the flatpak portal sends an
    "update available" signal several times.
    
    But the plugin currently doesn't replace the old update notification
    with a newer one, so they start to pile up in the build popover.
    
    So this commit stops early in the "update available" signal callback in
    case a notification is already there.

 src/plugins/update-manager/gbp-update-manager-app-addin.c | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/src/plugins/update-manager/gbp-update-manager-app-addin.c 
b/src/plugins/update-manager/gbp-update-manager-app-addin.c
index 765e238f7..18ea727ac 100644
--- a/src/plugins/update-manager/gbp-update-manager-app-addin.c
+++ b/src/plugins/update-manager/gbp-update-manager-app-addin.c
@@ -133,6 +133,12 @@ on_update_available_cb (GbpUpdateManagerAppAddin *self,
   g_assert (GBP_IS_UPDATE_MANAGER_APP_ADDIN (self));
   g_assert (XDP_IS_PORTAL (portal));
 
+  /* The flatpak portal will send an "update available" signal each time a new
+   * flatpak push of Builder happens, so it's better to not let notifications pile up.
+   */
+  if (self->update_notif)
+    return;
+
   if (self->app != NULL)
     {
       IdeWorkbench *workbench;