debounce for Listview

[ethael]

Hello. First, thank you for great TUI framework.

I am missing a "debounce" feature for widgets that hold collection of data which can be listed through like ListView or trees.
For example when there is a ListView on the left side and right side renders the content based on selected item. Currently, if the "rendering" task is heavy, for example like showing markdown document, the UX is far from smooth.

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[willmcgugan]

You could use set_interval to set a timer to update the content, and cancel the timer if you select another option within 200ms.