[evince/BUG_no_previews_on_scroll] EvView: preview popups only triggered by motion events

[Nelson Ben <nbenitez src gnome org>]

commit 8adc7c3b4638242776e932fed6ee70124aed2c2f
Author: Nelson Benítez León <nbenitezl gmail com>
Date:   Sun Jan 16 19:08:20 2022 -0400

    EvView: preview popups only triggered by motion events
    
    to avoid unwanted previews showing up in any of these
    situations:
    
    - when scrolling the view
    - when pressing PageUp/PageDown or NextPage/PrevPage keys
    - when changing to a page by clicking a bookmark or outline entry
    
    we make sure to only show them when moving the mouse over them
    (motion events).
    
    Fixes issue #1666

 libview/ev-view.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
---
diff --git a/libview/ev-view.c b/libview/ev-view.c
index 69c5904e6..455551901 100644
--- a/libview/ev-view.c
+++ b/libview/ev-view.c
@@ -2221,11 +2221,13 @@ ev_view_handle_cursor_over_xy (EvView *view, gint x, gint y)
                EvLinkDest      *dest;
                EvLinkDestType   type;
                GtkWidget       *popover, *spinner;
+               GdkEvent        *event;
                cairo_surface_t *page_surface = NULL;
                guint            link_dest_page;
                EvPoint          link_dest_doc;
                GdkPoint         link_dest_view;
                gint             device_scale = 1;
+               gboolean         from_motion = FALSE;
 
                ev_view_set_cursor (view, EV_VIEW_CURSOR_LINK);
 
@@ -2241,6 +2243,18 @@ ev_view_handle_cursor_over_xy (EvView *view, gint x, gint y)
                if (!dest)
                        return;
 
+               event = gtk_get_current_event ();
+               if (event) {
+                       if (event->type == GDK_MOTION_NOTIFY &&
+                           gdk_event_get_window (event) == gtk_widget_get_window (GTK_WIDGET (view))) {
+                               from_motion = TRUE;
+                       }
+                       gdk_event_free (event);
+               }
+               /* Show preview popups only for motion events - Issue #1666 */
+               if (!from_motion)
+                       return;
+
                type = ev_link_dest_get_dest_type (dest);
                if (type == EV_LINK_DEST_TYPE_NAMED) {
                        dest = ev_document_links_find_link_dest (EV_DOCUMENT_LINKS (view->document),