[gimp] app: various fixes in gimp_display_shell_set_show_all()

[Ell <ell src gnome org>]

commit 19817877a55bf31bc8c1e6f873a0e6900ad55adc
Author: Ell <ell_se yahoo com>
Date:   Thu Sep 5 13:17:55 2019 +0300

    app: various fixes in gimp_display_shell_set_show_all()

 app/display/gimpdisplayshell.c | 28 ++++++++++++++++++----------
 1 file changed, 18 insertions(+), 10 deletions(-)
---
diff --git a/app/display/gimpdisplayshell.c b/app/display/gimpdisplayshell.c
index a24722672a..65d51902ab 100644
--- a/app/display/gimpdisplayshell.c
+++ b/app/display/gimpdisplayshell.c
@@ -1775,30 +1775,38 @@ gimp_display_shell_set_show_all (GimpDisplayShell *shell,
 
   if (show_all != shell->show_all)
     {
-      GimpImage *image = gimp_display_get_image (shell->display);
-
       shell->show_all = show_all;
 
-      if (image)
+      if (shell->display && gimp_display_get_image (shell->display))
         {
+          GimpImage   *image = gimp_display_get_image (shell->display);
+          GimpContext *user_context;
+
           if (show_all)
             gimp_image_inc_show_all_count (image);
           else
             gimp_image_dec_show_all_count (image);
 
           gimp_image_flush (image);
-        }
 
-      gimp_display_update_bounding_box (shell->display);
+          gimp_display_update_bounding_box (shell->display);
 
-      gimp_display_shell_update_show_canvas (shell);
+          gimp_display_shell_update_show_canvas (shell);
 
-      gimp_display_shell_scroll_clamp_and_update (shell);
-      gimp_display_shell_scrollbars_update (shell);
+          gimp_display_shell_scroll_clamp_and_update (shell);
+          gimp_display_shell_scrollbars_update (shell);
 
-      gimp_display_shell_set_priority_viewport (shell);
+          gimp_display_shell_expose_full (shell);
 
-      gimp_display_shell_expose_full (shell);
+          user_context = gimp_get_user_context (shell->display->gimp);
+
+          if (shell->display == gimp_context_get_display (user_context))
+            {
+              gimp_display_shell_set_priority_viewport (shell);
+
+              gimp_ui_manager_update (shell->popup_manager, shell->display);
+            }
+        }
 
       g_object_notify (G_OBJECT (shell), "show-all");
     }