[shotwell] Speed up event creation

[Jens Georg <jensgeorg src gnome org>]

commit 53924d1e7f8db3f1b462e1486cb10bc288568b42
Author: Gert <gw fossdev gmail com>
Date:   Tue Oct 3 20:45:00 2017 +0000

    Speed up event creation
    
    Instead of switching to the event while populating it, first populate
    it, then switch to it. This avoids triggering a redraw each time a photo
    is added to the event.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=787400

 src/Commands.vala |   12 ++++++------
 1 files changed, 6 insertions(+), 6 deletions(-)
---
diff --git a/src/Commands.vala b/src/Commands.vala
index 75164c5..7441a50 100644
--- a/src/Commands.vala
+++ b/src/Commands.vala
@@ -920,6 +920,10 @@ public abstract class MovePhotosCommand : Command {
         }
         
         public override void execute() {
+
+            // create the new event
+            base.execute();
+
             // Are we at an event page already?
             if ((LibraryWindow.get_app().get_current_page() is EventPage)) {
                 Event evt = ((EventPage) LibraryWindow.get_app().get_current_page()).get_event();
@@ -933,17 +937,13 @@ public abstract class MovePhotosCommand : Command {
             } else {
                 // We're in a library or tag page.
                 
-                // Are we moving these to a newly-created (and therefore empty) event?
-                if (((Event) new_event_proxy.get_source()).get_media_count() == 0) {
+                // Are we moving these to a newly-created event (i.e. has same size)?
+                if (((Event) new_event_proxy.get_source()).get_media_count() == source_list.size) {
                     // Yes - jump to the new event.
                     LibraryWindow.get_app().switch_to_event((Event) new_event_proxy.get_source());
                 }
             }
-            
             // Otherwise - don't jump; users found the jumping disconcerting.
-            
-            // create the new event
-            base.execute();
         }
         
         public override void execute_on_source(DataSource source) {