Creating widget specific library

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I've made a couple of LCB libraries, however I discovered that they cannot be used by a widget to interact with the canvas. In general, there is a lot of code I reuse in widgets that I would like to not always copy and paste.

Let me try and provide a concrete example. On many of my widgets, I have settings for an OK and Cancel button at the bottom of the canvas. I use the same exact code for drawing them, I use the same exact code for interacting with them. Is there something I could/should do to take that code out of each widget and put into a centralized library. (Or is this something I should add as an issue/request on Github?)