Preserve cursor position in editors

[Gazook89]

This PR modifies the editor so that it preserves the cursor position in each the Brew and Style editors. It saves the locations in localStorage, and loads the related position when switching between editors and across page loads.

One side effect is that it does focus the Brew editor on page load. I don't think that is necessarily the worst thing, but I'm not sure that this change should be doing that. But until there is a more focused effort on how focus moves about the page, I think it's fine to leave as-is.

Another thing I thought about while working on this: it might be nice if when you open an editor (changing view or loading the page), the cursor did one or two stronger flashes so you can more easily spot where your cursor is when you first jump into a view. Not likely going in this PR, or any, but mentioning it in case anyone has further thoughts.

I feel like the commit messages (and expandable descriptions) are clear enough. i did try JSDoc annotations as well.

[5e-Cleric]

Need a deployment to test

[dbolack-ab]

One side effect is that it does focus the Brew editor on page load. I don't think that is necessarily the worst thing, but I'm not sure that this change should be doing that. But until there is a more focused effort on how focus moves about the page, I think it's fine to leave as-is.

This comes across as a feature, not a bug, to me.

Another thing I thought about while working on this: it might be nice if when you open an editor (changing view or loading the page), the cursor did one or two stronger flashes so you can more easily spot where your cursor is when you first jump into a view. Not likely going in this PR, or any, but mentioning it in case anyone has further thoughts.

This seems like a good idea for a future PR.

[5e-Cleric]

Another thing I thought about while working on this: it might be nice if when you open an editor (changing view or loading the page), the cursor did one or two stronger flashes so you can more easily spot where your cursor is when you first jump into a view. Not likely going in this PR, or any, but mentioning it in case anyone has further thoughts.

In CodeMirror, as far as i know, the cursor is an html div element:

Therefore it would be fairly simple to add styling to make this possible, added and then removed by js.

[Gazook89]

Yeah, not hard, I was already messing with it but still going to leave it for another PR where I’ll present some options and solicit other ideas.

[5e-Cleric]

Not seeing any localstorage item popping up, neither across loads.

[dbolack-ab]

Duplidcumenting here from chat:

Seems to work after I had my session loaded. Though I'm not sure if it didn't trigger right initially? I didn't see any local storage added. I switched to styles and it crashed. Reloaded to see if I could duplicate it and it then had the values. Worked fine. Reloaded. Deleted the local storage values, switched panes, crash. Looks like it doesn't gracefully handle the values not being in local storage.