cross-tab-copy-paste needs keyCodes

[maribethb]

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Component

cross-tab-copy-paste

Description

The cross-tab-copy-paste plugin registers keyboard shortcut handlers for cut/copy/paste, but it doesn't set the keyCodes property directly, it manually adds key combinations. we should update it to use keyCodes, because the keyboard-navigation plugin relies on the keyCodes being set in order override the behavior.

this is a blocker for code.org

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