Fix MenuItem enabled state in the presence of sub-items.

[grokys]

What does the pull request do?

If a menu has a failed Command binding, then like other controls which accept a Command - it gets disabled.

However there is a problem when building menus from templates and bindings because a style which applies commands to menu items applies commands to all menu items indiscriminately. This means that a menu which has sub-items must now have a "dummy" command to bind to, otherwise the menu item (and by extension its children) gets disabled.

This PR modifies the behavior of MenuItem to only disable itself when a Command binding fails if the menu item has no sub-items. If a menu has sub-items then the binding state of Command is ignored.

[MrJul]

Is the change from base.IsEnabledCore to base.IsEnabled wanted? The logic stays the same (currently base.IsEnabledCore returns IsEnabled), but it seems a little odd to not refer to the base property.

[avaloniaui-bot]

You can test this PR using the following package version. 12.0.999-cibuild0056092-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

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1 out of 2 committers have signed the CLA.

• @grokys
• @AnastassiaP