[evince/wip/gpoo/fix-evview-focus] shell: allow EvView to correctly receive focus

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

commit d7ea0f8cae5add4716c66a7c5ba2a8c683dd1baa
Author: Nelson Benítez León <nbenitezl gmail com>
Date:   Sun Jan 16 14:45:30 2022 -0400

    shell: allow EvView to correctly receive focus
    
    This fixes bad behaviour described in following comment:
    https://gitlab.gnome.org/GNOME/evince/-/issues/704#note_1350123
    
    which is than when TAB key switching focus to the document view
    it does not get it the first time, you have to play some UP and
    DOWN arrow till it gets it (as described in previous comment).
    
    The reason is that GTK does not pass the focus directly to EvView
    but to the GtkScrolledWindow that contains it. But we really want
    the focus to end up in the EvView, so we manually do that so the
    focus TAB chain performs as expected.
    
    Part of issue #704

 shell/ev-window.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)
---
diff --git a/shell/ev-window.c b/shell/ev-window.c
index 634caafa2..627fdb513 100644
--- a/shell/ev-window.c
+++ b/shell/ev-window.c
@@ -1054,6 +1054,15 @@ scroll_child_history_cb (GtkScrolledWindow *scrolled_window,
        }
 }
 
+static gboolean
+scrolled_window_focus_in_cb (GtkScrolledWindow *scrolled_window,
+                            GdkEventFocus     *event,
+                            EvWindow          *window)
+{
+       ev_window_focus_view (window);
+       return GDK_EVENT_STOP;
+}
+
 static void
 view_selection_changed_cb (EvView   *view,
                           EvWindow *window)
@@ -7728,6 +7737,9 @@ ev_window_init (EvWindow *ev_window)
        g_signal_connect_object (priv->scrolled_window, "scroll-child",
                                 G_CALLBACK (scroll_child_history_cb),
                                 ev_window, 0);
+       g_signal_connect_object (priv->scrolled_window, "focus-in-event",
+                                G_CALLBACK (scrolled_window_focus_in_cb),
+                                ev_window, 0);
        g_signal_connect_object (priv->view, "annot-added",
                                 G_CALLBACK (view_annot_added),
                                 ev_window, 0);