Using a KAbstractFileItemActionPlugin allows to have more control over when actions are shown in context menus.
FIXED-IN: 21.04
Test plan:
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Right click any number of folders with no images in it -> Start a slideshow is not visible
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Right click on any number of folder(s) containing at least one image -> Start a slideshow is visible
Same for files.
When the selection contains a mix of folders and files the action is not displayed.
Remaining question: how to remove the old SlideShow Service Menus ?