Overdrawn symbols at tile corner

[jfirebaugh]

If you have a symbol layer with text for a feature at null island, at any zoom level other than 0, it'll be overdrawn. Presumably what's happening is that the feature appears within all of the four tiles which have a corner at null island, and is getting drawn by all of them.

Test case:

{
  "version": 8,
  "metadata": {
    "test": {
      "height": 64,
      "width": 64
    }
  },
  "zoom": 1,
  "sources": {
    "point": {
      "type": "geojson",
      "data": {
        "type": "Point",
        "coordinates": [ 0, 0 ]
      }
    }
  },
  "glyphs": "local://glyphs/{fontstack}/{range}.pbf",
  "layers": [
    {
      "id": "text",
      "type": "symbol",
      "source": "point",
      "layout": {
        "text-field": "xxx",
        "text-font": [
          "Open Sans Semibold",
          "Arial Unicode MS Bold"
        ]
      }
    }
  ]
}

Expected result:

Actual result:

[jfirebaugh]

See #4729 for another demo of this issue.

[jfirebaugh]

@ChrisLoer This should be fixed by viewport collision detection, right?

[ChrisLoer]

@jfirebaugh Yup, I'll turn this into a regression test case and close it.

[ChrisLoer]

Fixed in #5150, test in #5515.