I have investigated this issue, and the problem is that the
_refresh_apps_with_app_cache method after the back button press is
invoked twice, with the following stacktraces (removed most of the
common part from the traces, like Gtk.main(), etc):
1. File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/widgets/backforward.py",
line 83, in on_clicked
self.emit(button.signal_name)
File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/session/viewmanager.py",
line 85, in on_nav_back_clicked
pane.on_nav_back_clicked(widget)
File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/panes/softwarepane.py",
line 277, in on_nav_back_clicked
vm.nav_back()
File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/session/viewmanager.py",
line 221, in nav_back
self.navhistory.nav_back()
File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/session/navhistory.py",
line 77, in nav_back
nav_item.navigate_to()
File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/session/navhistory.py",
line 139, in navigate_to
self.view_state, self.callback)
File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/session/viewmanager.py",
line 195, in display_page
callback(page, view_state)
File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/panes/availablepane.py",
line 678, in display_app_view_page
self.refresh_apps()
File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/panes/availablepane.py",
line 813, in refresh_apps
SoftwarePane.refresh_apps(self, query)
File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/panes/softwarepane.py",
line 417, in refresh_apps
self._refresh_apps_with_apt_cache(query)
File "/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/utils.py", line
119, in wrapper
f(*args, **kwargs)
File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/panes/softwarepane.py",
line 439, in _refresh_apps_with_apt_cache
traceback.print_stack()
2. File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/widgets/backforward.py",
line 83, in on_clicked
self.emit(button.signal_name)
File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/session/viewmanager.py",
line 85, in on_nav_back_clicked
pane.on_nav_back_clicked(widget)
File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/panes/softwarepane.py",
line 277, in on_nav_back_clicked
vm.nav_back()
File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/session/viewmanager.py",
line 221, in nav_back
self.navhistory.nav_back()
File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/session/navhistory.py",
line 77, in nav_back
nav_item.navigate_to()
File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/session/navhistory.py",
line 139, in navigate_to
self.view_state, self.callback)
File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/session/viewmanager.py",
line 195, in display_page
callback(page, view_state)
File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/panes/availablepane.py",
line 678, in display_app_view_page
self.refresh_apps()
File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/panes/availablepane.py",
line 813, in refresh_apps
SoftwarePane.refresh_apps(self, query)
File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/panes/softwarepane.py",
line 417, in refresh_apps
self._refresh_apps_with_apt_cache(query)
File "/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/utils.py", line
119, in wrapper
f(*args, **kwargs)
File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/panes/softwarepane.py",
line 440, in _refresh_apps_with_apt_cache
self.app_view.configure_sort_method(self._is_in_search_mode())
File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/views/appview.py",
line 225, in configure_sort_method
self._use_combobox_without_sort_by_search_ranking()
File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/views/appview.py",
line 157, in _use_combobox_without_sort_by_search_ranking
self.sort_methods_combobox.remove(self._SORT_BY_SEARCH_RANKING)
File "/usr/lib/python2.7/dist-packages/gi/types.py", line 43, in function
return info.invoke(*args, **kwargs)
File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/views/appview.py",
line 135, in on_sort_method_changed
self.emit("sort-method-changed", self.sort_methods_combobox)
File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/panes/softwarepane.py",
line 296, in on_app_view_sort_method_changed
self._refresh_apps_with_apt_cache(query)
File "/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/utils.py", line
119, in wrapper
f(*args, **kwargs)
File
"/home/evfool/Projects/ubuntu/sctrunk/softwarecenter/ui/gtk3/panes/softwarepane.py",
line 439, in _refresh_apps_with_apt_cache
traceback.print_stack()
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https://bugs.launchpad.net/bugs/915956
Title:
List of displayed applications duplicates after searching in “What's
new”
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https://bugs.launchpad.net/ubuntu/+source/software-center/+bug/915956/+subscriptions
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