Temporal scale domains broken in vega-lite 4.5

[jakevdp]

First reported in https://stackoverflow.com/questions/60623578/how-do-i-set-the-max-and-min-of-the-x-axis-of-vega-lite-time-series-chart/60623883

Here is an example spec:

{
  "$schema": "https://vega.github.io/schema/vega-lite/v4.json",
  "data": {
    "values": [
      {"ts": 1500400000000, "v": 1},
      {"ts": 1500500000000, "v": 2},
      {"ts": 1500600000000, "v": 3},
      {"ts": 1500700000000, "v": 2}
    ]
  },
  "width": 800,
  "height": 300,
  "mark": {"type": "line"},
  "encoding": {
    "x": {"field": "ts", "type": "temporal", "scale": {"domain": [1500000000000, 1500900000000]}},
    "y": {"field": "v", "type": "quantitative", "scale": {"domain": [0, 5]}}
  }
}

In Vega-Lite 4.4, the result is this:

In Vega-Lite 4.5, the result is this:

[kanitw]

@domoritz Looks like #5957 is wrong.

Currently the spec outputs:

{
        "fields": [
          {"signal": "datetime(1500000000000)"},
          {"signal": "datetime(1500900000000)"}
        ]
      }

But if we revert to:

 [
          {"signal": "{data: datetime(1500000000000)}"},
          {"signal": "{data: datetime(1500900000000)}"}
        ]

It works correctly.

[SyntaxRules]

Here is a another use case for the same bug: Vega Editor

[domoritz]

Looks like it's not the same. @SyntaxRules can you file a separate issue?

[kanitw]

I think it's the same.

[domoritz]

Hmm, the screenshot above is from master just now.

[SyntaxRules]

@domoritz Issue created per your request. Testing this on the version 4.6.0 online editor produces the same error state.

Issue here: #6068

[domoritz]

Thank you