Historically creating these kinds of controls has required JavaScript event listeners added to the button which can then call the APIs on the element they control. The commandForElement and command properties provide a way to do this declaratively for a limited set of actions. This can be advantageous for built-in commands as the user does not have to wait for JavaScript to download and execute to make these buttons interactive.
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My editor is pane-based and supports many buffers open next to one-another. It quickly became clear that the convenience of
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