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I’m aware of why using internal classes is discouraged, and am generally happy to stick to not using them.
However, in my RCP I want to use a command rather than an action to display the About dialog. Hence I have extended org.eclipse.ui.internal.about.AboutHandler for my handler class, which is discouraged.
Is there a workaround available to use this class or rather its functionality?
I think, you could reuse the existing contribution:
If you have the command ID, you could simply specify a menu contribution for the item, as shown in the following tutorial using the cut/copy/paste items.