Issue with image encoding on maps

[xoolive]

This issue is probably related to #6580 and comes after further investigation after this question on StackOverflow: https://stackoverflow.com/questions/66556550/plotting-image-on-maps-with-vega-lite-altair

The code below does not display the images. In the Vega (not lite) editor, it seems:

• x1 and x2 channels are artificially added;
• width and height configurations disappeared (see Image on a map: NaN width/height #6580)

Editing the corresponding code in the Vega editor accordingly seems to fix the issue:

		  "x": {"field": "layer_1_x"},
          "y": {"field": "layer_1_y"},
          "width": {"value": 60},
          "height": {"value": 60},

Working link with Vega
Not working link with Vega-Lite

{
  "config": {"view": {"continuousWidth": 300, "continuousHeight": 400}},
  "layer": [
    {
      "mark": {"type": "text", "font": "Ubuntu", "fontSize": 18},
      "encoding": {
        "latitude": {"field": "latitude", "type": "quantitative"},
        "longitude": {"field": "longitude", "type": "quantitative"},
        "text": {"type": "nominal", "field": "name"}
      }
    },
    {
      "mark": {"type": "image", "height": 60, "width": 60},
      "encoding": {
        "latitude": {"field": "latitude", "type": "quantitative"},
        "longitude": {"field": "longitude", "type": "quantitative"},
        "url": {"type": "nominal", "field": "url"}
      }
    }
  ],
  "data": {"name": "data"},
  "$schema": "https://vega.github.io/schema/vega-lite/v5.0.0.json",
  "datasets": {
    "data": [...]
  }
}

[domoritz]

It looks like we don't handle images correctly with geo coordinates. Thanks for the bug report.

x and y work correctly Open the Chart in the Vega Editor

long/lat do not Open the Chart in the Vega Editor

We need to update https://github.com/vega/vega-lite/blob/master/src/compile/mark/encode/position-rect.ts.

[xoolive]

Thanks for the pointer. I'm pretty Javascript illiterate but this could be the occasion, esp. if you tell me where to look.

I'll give it a try

[domoritz]

I think this is a duplicate of #6580, though.

[xoolive]

Indeed @domoritz the same fix works there as well.

[domoritz]

I think #7296 fixes it.

[xoolive]

Thanks, looking forward to try it in next release!