Moving up and down the project tree without arrow keys

I have remapped the arrow keys to alt + some home row keys. So, if for example I search by a class name, I can easily move the selection up and down keeping my fingers on the home row. Unfortunately, this does not work in the lists with the 'search for' feature, where you can type stuff to narrow down. Nothing happens when I press my rebound hot keys and the only way to navigate is to use the arrow keys. Is there any way to replace arrow keys for the navigation through such lists?

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