axis labelAlign manually set to left overlaps chart by default (without layerPadding)

[declann]

Hi guys!

Currently planning to simulate indented tree-type axes labels by using emojis and some logic in my data processing :)
separate issue Re indented trees: #3382

For this workaround I need to left-align my y axis labels and transform the field to include correct spacers/emojis.

Here is a 'working' (slightly over-complicated layered) example from vega-lite:

https://vega.github.io/editor/#/gist/838b2b13abe1d3bb96f14afcc34869d4/spec.json

Here is the relevant y-encoding axis spec:

      "axis": {"ticks": false, "labelAlign": "left", "labelPadding": 150}

It works fine, but I found that I must specify labelPadding here, or else the labels overlap with the chart:

Here is a slightly simplified spec compiled to vega:

https://vega.github.io/editor/#/gist/94b8b93e347448381e07861e300e9a29/spec.json

among the final lines under axes it has:

      "labelAlign": "left",

By changing to right, the chart is OK and padding doesn't need to be specified.

However, my desired indenting effect depends on left-align. I can specify padding (as above), but for generating these charts it's a little problematic.

Is it feasible for vega to calculate the padding for left-align as it does for right-align, whenever no padding is specified?

Note: similar issue when I try "labelAlign": "center"

Related: #1751

Thanks,
Declan