[evince] EvPresentationView: don't start render job until realized

[Germán Poo-Caamaño <gpoo src gnome org>]

commit 92c76a87fe879e69789329c7bcb76899c64e1e56
Author: Jason Crain <jcrain src gnome org>
Date:   Sat Jun 1 21:03:42 2019 -0600

    EvPresentationView: don't start render job until realized
    
    "notify::scale-factor" can be signalled before the view is realized,
    which can start the render jobs before it has a valid view size. Don't
    schedule render jobs until after the view is realized.
    
    Fixes #1177

 libview/ev-view-presentation.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/libview/ev-view-presentation.c b/libview/ev-view-presentation.c
index 377cc963..012503df 100644
--- a/libview/ev-view-presentation.c
+++ b/libview/ev-view-presentation.c
@@ -1459,6 +1459,9 @@ ev_view_presentation_get_property (GObject    *object,
 static void
 ev_view_presentation_notify_scale_factor (EvViewPresentation *pview)
 {
+        if (!gtk_widget_get_realized (GTK_WIDGET (pview)))
+                return;
+
         ev_view_presentation_update_monitor_geometry (pview);
         ev_view_presentation_reset_jobs (pview);
         ev_view_presentation_update_current_page (pview, pview->current_page);