installed-page: Save extension's toggle focus on state changes #773
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The items-changed signal is now emitted without adding or removing items to the model from ExmManager and is connected after binding the manager in ExmInstalledPage from where the callback saves, emits items-changed adding and removing as done before in ExmManager, and restores focus.
This approach allows us to keep binding GtkListBox to the extensions model and not having to manage the changes manually.
Fix #220