[evince] libview: Cleanup link preview popover, on mouseover of it

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

commit cf569bd229a74073d1d69a87ba2f06100d83954c
Author: Mads Chr. Olesen <mads mchro dk>
Date:   Sat Jun 27 12:35:57 2020 +0200

    libview: Cleanup link preview popover, on mouseover of it
    
    Partially fixes #662

 libview/ev-view.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)
---
diff --git a/libview/ev-view.c b/libview/ev-view.c
index aa3491ce..51f856f4 100644
--- a/libview/ev-view.c
+++ b/libview/ev-view.c
@@ -159,6 +159,8 @@ static void       link_preview_show_thumbnail                (GdkPixbuf
                                                              EvView             *view);
 static void       link_preview_job_finished_cb               (EvJobThumbnail     *job,
                                                              EvView             *view);
+static gboolean   link_preview_popover_motion_notify         (EvView             *view,
+                                                             GdkEventMotion     *event);
 /*** Forms ***/
 static EvFormField *ev_view_get_form_field_at_location       (EvView             *view,
                                                               gdouble            x,
@@ -2243,6 +2245,9 @@ ev_view_handle_cursor_over_xy (EvView *view, gint x, gint y)
                get_link_area (view, x, y, link, &link_area);
                gtk_popover_set_pointing_to (GTK_POPOVER (popover), &link_area);
                gtk_popover_set_modal (GTK_POPOVER (popover), FALSE);
+               g_signal_connect_swapped (popover, "motion-notify-event",
+                                         G_CALLBACK (link_preview_popover_motion_notify),
+                                         view);
 
                spinner = gtk_spinner_new ();
                gtk_spinner_start (GTK_SPINNER (spinner));
@@ -5217,6 +5222,14 @@ link_preview_show_thumbnail (GdkPixbuf *pixbuf,
        g_object_unref (thumbnail_slice);
 }
 
+static gboolean
+link_preview_popover_motion_notify (EvView         *view,
+                                   GdkEventMotion *event)
+{
+       ev_view_link_preview_popover_cleanup (view);
+       return TRUE;
+}
+
 static void
 link_preview_job_finished_cb (EvJobThumbnail *job,
                              EvView *view)