[epiphany] Set floating bar alignment based on enter-notify-event

[Alexander Mikhaylenko <alexm src gnome org>]

commit fab2c8dc270b503edf3337ef86788b6772b417f8
Author: Jan-Michael Brummer <jan brummer tabos org>
Date:   Sun Oct 25 15:55:55 2020 +0100

    Set floating bar alignment based on enter-notify-event
    
    In case the pointer hovers the floating bar move it to the other direction.
    
    Fixes: https://gitlab.gnome.org/GNOME/epiphany/-/issues/1368

 embed/ephy-embed.c | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)
---
diff --git a/embed/ephy-embed.c b/embed/ephy-embed.c
index f0d4a15b5..327156b34 100644
--- a/embed/ephy-embed.c
+++ b/embed/ephy-embed.c
@@ -686,6 +686,26 @@ ephy_embed_mapped_cb (GtkWidget *widget,
   ephy_embed_maybe_load_delayed_request ((EphyEmbed *)widget);
 }
 
+static gboolean
+on_enter_notify_event (GtkWidget        *widget,
+                       GdkEventCrossing *event,
+                       gpointer          user_data)
+{
+  EphyEmbed *embed = EPHY_EMBED (user_data);
+
+  if (event->window != gtk_widget_get_window (embed->floating_bar))
+    return GDK_EVENT_PROPAGATE;
+
+  if (gtk_widget_get_halign (embed->floating_bar) == GTK_ALIGN_START)
+    gtk_widget_set_halign (embed->floating_bar, GTK_ALIGN_END);
+  else
+    gtk_widget_set_halign (embed->floating_bar, GTK_ALIGN_START);
+
+  gtk_widget_queue_allocate (embed->overlay);
+
+  return GDK_EVENT_STOP;
+}
+
 static void
 ephy_embed_constructed (GObject *object)
 {
@@ -721,9 +741,9 @@ ephy_embed_constructed (GObject *object)
   gtk_widget_set_halign (embed->floating_bar, GTK_ALIGN_START);
   gtk_widget_set_valign (embed->floating_bar, GTK_ALIGN_END);
   gtk_widget_set_no_show_all (embed->floating_bar, TRUE);
+  g_signal_connect_object (embed->overlay, "enter-notify-event", G_CALLBACK (on_enter_notify_event), embed, 
0);
 
   gtk_overlay_add_overlay (GTK_OVERLAY (embed->overlay), embed->floating_bar);
-  gtk_overlay_set_overlay_pass_through (GTK_OVERLAY (embed->overlay), embed->floating_bar, TRUE);
 
   if (embed->progress_bar_enabled) {
     embed->progress = gtk_progress_bar_new ();