Bugfix: make Scene Management widget closable (settings persist) #67
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This PR aims to fix #66
When a multi-scene file is loaded, two widgets are created.
One has two checkboxes, the other has the scenes to load.
The status of the first widget (the checkboxes) is checked when the scenes are to be loaded. As a result, if that widget is closed an error is raised.
In this PR, the first widget instead sets global variables, so it need not be open.
If the settings are applied, then the widget can be closed and scenes can be loaded.
(this permits more vertical space for scene selection, particularly on smaller screens—like mine!)
Additionally, the previous values are persisted thanks to magicgui.