[gnome-calendar/wip/pandusonu/week-view] week-view: avoid segfault when scrolling when unmapped

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit f134da5a1d2410f8851576d5f0fe6618acb75c0b
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Fri Dec 9 14:47:02 2016 -0200

    week-view: avoid segfault when scrolling when unmapped

 src/views/gcal-week-view.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/views/gcal-week-view.c b/src/views/gcal-week-view.c
index 91108be..6dbee22 100644
--- a/src/views/gcal-week-view.c
+++ b/src/views/gcal-week-view.c
@@ -148,6 +148,9 @@ update_grid_scroll_position (GcalWeekView *self)
   if (datetime_compare_date (now, week_start) < 0 || datetime_compare_date (now, week_end) >= 0)
     return;
 
+  if (!gtk_widget_get_mapped (self->scrolled_window))
+    return;
+
   vadjustment = gtk_scrolled_window_get_vadjustment (GTK_SCROLLED_WINDOW (self->scrolled_window));
   minutes = g_date_time_get_hour (now) * 60 + g_date_time_get_minute (now);
   page = gtk_adjustment_get_page_size (vadjustment);