Scroll dataframe view to focused item

[abey79]

What

This PR scrolls the dataframe view to the focused entity/instance.

This would be further enhanced by addressing:

• Track the "source" of a focusing action #6906
• Double-click to focus on a point no longer works #5382

dataframe_scroll_focus.mp4

Checklist

• I have read and agree to Contributor Guide and the Code of Conduct
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  • Using examples from latest main build: rerun.io/viewer
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[Wumpf]

neat

[Wumpf]

nit: if the separation is important to you, why don't you make it several functions? :)

[abey79]

Short answer, because of the tight coupling these functions would have, implying tuple return values and loads of parameters. I feel this would be strictly worse for such cases (aka. a "mono-function" file with that very "sequential" nature to it).

I'm not super happy with the status quo either. I wish rustfmt would let me insert an additional newline or two between "sections". Could go with the "// ================"-style comment, but I'm more used to have them between functions.

Arf.. life is though.

[abey79]

Gonna merge as is. This code is likely to be rewritten 3 times in the next couple of months anyways :)