Check on entry.Layer needs to happen before assigning entry.Layer.zIndex

[simon-leech]

MVT Clone Fix

Description

Bug fix here. If entry.Layer is undefined - ie the layer to clone is not accessible, and the entry has no zIndex. The code attempts to set the entry.zIndex to entry.Layer.zIndex. But as entry.Layer does not exist, it crashes.

  // Assign the mvt layer to be cloned from mapview layers.
  entry.Layer = entry.mapview.layers[entry.layer]

  entry.zIndex ??= entry.Layer.zIndex

  if (!entry.Layer) {
    console.warn('mvt_clone Layer not found in mapview.layers object.')
    return;
  }

To fix this I simply swapped the code around. This way - if the entry.Layer does not exist then the return happens and no crash occurs.

  // Assign the mvt layer to be cloned from mapview layers.
  entry.Layer = entry.mapview.layers[entry.layer]

  if (!entry.Layer) {
    console.warn('mvt_clone Layer not found in mapview.layers object.')
    return;
  }

  entry.zIndex ??= entry.Layer.zIndex

Type of Change

Please delete options that are not relevant, and select all options that apply.

• ✅ Bug fix (non-breaking change which fixes an issue)

How have you tested this?

Tested locally.

Testing Checklist

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• ✅ Existing Tests still pass
• ✅ Updated Existing Tests
• ✅ New Tests Added
• ✅ Ran locally on my machine

Code Quality Checklist

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• ✅ My code follows the guidelines of XYZ
• ✅ My code has been commented
• ✅ Documentation has been updated
• ✅ New and existing unit tests pass locally with my changes
• ✅ Main has been merged into this PR