[pitivi] application: Allow more than one Pitivi instance

[Alexandru Băluț <alexbalut src gnome org>]

commit 423963f2b3347283ba21fc1888a16c01297bd2a4
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Sat Aug 31 00:11:45 2019 +0200

    application: Allow more than one Pitivi instance

 pitivi/application.py       |  6 +++---
 pitivi/editorperspective.py | 12 ------------
 2 files changed, 3 insertions(+), 15 deletions(-)
---
diff --git a/pitivi/application.py b/pitivi/application.py
index 05ec092c..ce7c7a58 100644
--- a/pitivi/application.py
+++ b/pitivi/application.py
@@ -71,7 +71,8 @@ class Pitivi(Gtk.Application, Loggable):
     def __init__(self):
         Gtk.Application.__init__(self,
                                  application_id="org.pitivi.Pitivi",
-                                 flags=Gio.ApplicationFlags.HANDLES_OPEN)
+                                 flags=Gio.ApplicationFlags.NON_UNIQUE &
+                                 Gio.ApplicationFlags.HANDLES_OPEN)
         Loggable.__init__(self)
 
         self.settings = None
@@ -216,8 +217,7 @@ class Pitivi(Gtk.Application, Loggable):
         self.create_main_window()
         self.gui.show()
         if len(giofiles) > 1:
-            self.warning(
-                "Can open only one project file at a time. Ignoring the rest!")
+            self.warning("Opening only one project at a time. Ignoring the rest!")
         project_file = giofiles[0]
         self.project_manager.load_project(quote_uri(project_file.get_uri()))
         return True
diff --git a/pitivi/editorperspective.py b/pitivi/editorperspective.py
index da4d3f45..da3386db 100644
--- a/pitivi/editorperspective.py
+++ b/pitivi/editorperspective.py
@@ -272,14 +272,6 @@ class EditorPerspective(Perspective, Loggable):
         headerbar = Gtk.HeaderBar()
         headerbar.set_show_close_button(True)
 
-        back_button = Gtk.Button.new_from_icon_name(
-            "go-previous-symbolic", Gtk.IconSize.SMALL_TOOLBAR)
-        back_button.set_always_show_image(True)
-        back_button.set_tooltip_text(_("Close project"))
-        back_button.connect("clicked", self.__close_project_cb)
-        back_button.set_margin_right(4 * PADDING)
-        headerbar.pack_start(back_button)
-
         undo_button = Gtk.Button.new_from_icon_name(
             "edit-undo-symbolic", Gtk.IconSize.SMALL_TOOLBAR)
         undo_button.set_always_show_image(True)
@@ -396,10 +388,6 @@ class EditorPerspective(Perspective, Loggable):
 
 # Toolbar/Menu actions callback
 
-    def __close_project_cb(self, unused_button):
-        """Closes the current project."""
-        self.app.project_manager.closeRunningProject()
-
     def __save_project_cb(self, unused_action, unused_param):
         self.saveProject()