[evince] ev-view-accessible: Initialize private fields

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

commit 8e13d1ce309f08bb450d5fc1e73818a61a3156a6
Author: Samuel Thibault <samuel thibault ens-lyon org>
Date:   Fri Aug 30 15:25:46 2019 +0200

    ev-view-accessible: Initialize private fields
    
    Otherwise the default zero initialization will make
    ev_view_accessible_set_page_range think that we already have page range
    0-0 set.
    
    Fixes GNOME/orca#54

 libview/ev-view-accessible.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)
---
diff --git a/libview/ev-view-accessible.c b/libview/ev-view-accessible.c
index 0f104c8c..f7e48db8 100644
--- a/libview/ev-view-accessible.c
+++ b/libview/ev-view-accessible.c
@@ -122,6 +122,8 @@ static void
 ev_view_accessible_initialize (AtkObject *obj,
                               gpointer   data)
 {
+       EvViewAccessiblePrivate *priv;
+
        if (ATK_OBJECT_CLASS (ev_view_accessible_parent_class)->initialize != NULL)
                ATK_OBJECT_CLASS (ev_view_accessible_parent_class)->initialize (obj, data);
 
@@ -129,6 +131,11 @@ ev_view_accessible_initialize (AtkObject *obj,
 
        atk_object_set_name (obj, _("Document View"));
        atk_object_set_role (obj, ATK_ROLE_DOCUMENT_FRAME);
+
+       priv = EV_VIEW_ACCESSIBLE (obj)->priv;
+       priv->previous_cursor_page = -1;
+       priv->start_page = 0;
+       priv->end_page = -1;
 }
 
 gint
@@ -326,12 +333,15 @@ ev_view_accessible_cursor_moved (EvView *view,
        EvPageAccessible *page_accessible = NULL;
 
        if (priv->previous_cursor_page != page) {
-               AtkObject *previous_page = NULL;
                AtkObject *current_page = NULL;
 
-               previous_page = g_ptr_array_index (priv->children,
-                                                  priv->previous_cursor_page);
-               atk_object_notify_state_change (previous_page, ATK_STATE_FOCUSED, FALSE);
+               if (priv->previous_cursor_page >= 0) {
+                       AtkObject *previous_page = NULL;
+                       previous_page = g_ptr_array_index (priv->children,
+                                                          priv->previous_cursor_page);
+                       atk_object_notify_state_change (previous_page, ATK_STATE_FOCUSED, FALSE);
+               }
+
                priv->previous_cursor_page = page;
                current_page = g_ptr_array_index (priv->children, page);
                atk_object_notify_state_change (current_page, ATK_STATE_FOCUSED, TRUE);