Only load pages when their tab is switched to upon session restore

Firefox has led the way implementing this behaviour to improve the experience
of restoring a session with lots of tabs. By delaying the loading of pages to
when the user shows interest in them, the time it takes for the browser to
become usable is diminished, and less pages are loaded in parallel, which
improves load time for the first pages the user sees.

It also has the advante of displaying less HTTP Basic Auth dialogs, when the
user has many tabs pointed to the same server.

https://bugzilla.gnome.org/show_bug.cgi?id=675302

1 files changed, 6 insertions, 3 deletions

diff --git a/src/ephy-shell.c b/src/ephy-shell.c
index 7fd01d7de..ebdd48fd0 100644
--- a/src/ephy-shell.c
+++ b/src/ephy-shell.c
@@ -730,6 +730,7 @@ ephy_shell_new_tab_full (EphyShell *shell,
   gboolean fullscreen_lockdown = FALSE;
   gboolean in_new_window = TRUE;
   gboolean open_page = FALSE;
+  gboolean delayed_open_page = FALSE;
   gboolean jump_to = FALSE;
   gboolean active_is_blank = FALSE;
   gboolean copy_history = TRUE;
@@ -748,6 +749,7 @@ ephy_shell_new_tab_full (EphyShell *shell,
   embed_shell = EPHY_EMBED_SHELL (shell);
 
   if (flags & EPHY_NEW_TAB_OPEN_PAGE) open_page = TRUE;
+  if (flags & EPHY_NEW_TAB_DELAYED_OPEN_PAGE) delayed_open_page = TRUE;
   if (flags & EPHY_NEW_TAB_IN_NEW_WINDOW) in_new_window = TRUE;
   if (flags & EPHY_NEW_TAB_IN_EXISTING_WINDOW) in_new_window = FALSE;
   if (flags & EPHY_NEW_TAB_DONT_COPY_HISTORY) copy_history = FALSE;
@@ -756,7 +758,7 @@ ephy_shell_new_tab_full (EphyShell *shell,
   fullscreen_lockdown = g_settings_get_boolean (EPHY_SETTINGS_LOCKDOWN,
                                                 EPHY_PREFS_LOCKDOWN_FULLSCREEN);
   in_new_window = in_new_window && !fullscreen_lockdown;
-  g_return_val_if_fail (open_page == (gboolean)(request != NULL), NULL);
+  g_return_val_if_fail ((open_page || delayed_open_page) == (gboolean)(request != NULL), NULL);
 
   LOG ("Opening new tab parent-window %p parent-embed %p in-new-window:%s jump-to:%s",
        parent_window, previous_embed, in_new_window ? "t" : "f", jump_to ? "t" : "f");
@@ -822,7 +824,7 @@ ephy_shell_new_tab_full (EphyShell *shell,
     ephy_window_activate_location (window);
     ephy_web_view_load_homepage (view);
     is_empty = TRUE;
-  } else if (flags & EPHY_NEW_TAB_OPEN_PAGE) {
+  } else if (open_page) {
     ephy_web_view_load_request (ephy_embed_get_web_view (embed),
                                 request);
 
@@ -831,7 +833,8 @@ ephy_shell_new_tab_full (EphyShell *shell,
 #else
     is_empty = ephy_embed_utils_url_is_empty (webkit_network_request_get_uri (request));
 #endif
-  }
+  } else if (delayed_open_page)
+      ephy_embed_set_delayed_load_request (embed, request);
 
   /* Make sure the initial focus is somewhere sensible and not, for
    * example, on the reload button.