Persisting state

There are two ways to persist state and preference either with VLC variables or using Qt QSettings system. The rule of thumb is that settings & preferences should be stored using VLC variables (should we display CSD, should the application resize to the video size, etc), whereas application state (window position, is the playlist visible) should be stored in QSettings

• Most settings & preferences will be loaded by MainCtx within the MainCtx::loadPrefs procedure. Settings may be loaded manually for specific use case using the usual VLC var_inheritXXXX API on the qt_intf_t object.

• Most states will be loaded by MainCtx within the MainCtx::loadFromSettingsImpl and saved within MainCtx destructor the QSetting instance is store in the qt_intf_t object if there is a need to access outside MainCtx.