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I'm looking into #56, can someone explain what `LineMarkerDescription.slowLM` is? `LineMarkerDescription.lineMarker` seems fairly intuitive, but `slowLM` seems to only ever be empty.

In `Ide` there are 2 different types of `LineMarkers` the `fast` one which registers immediately at the element you specified here <https://github.com/arrow-kt/arrow-meta/blob/511ecfee3bb205338d8ad77e3795d12cb3471cca/idea-plugin/src/main/kotlin/arrow/meta/ide/dsl/editor/lineMarker/LineMarkerSyntax.kt#L71> or the `slowLineMarkers`, which start at the root of the node e.g.: `KtFile` and traverses each subnode for your specified element.
The latter is `slow` by definition, as it has to traverse and collect at the same time. We set the default for users to the fast one.
You can improve the resolution speed even more, if you add an `PNG` Icon instead of an `SVG`. But the marketplace standard is usually `SVG`.

<https://github.com/arrow-kt/arrow-meta/blob/511ecfee3bb205338d8ad77e3795d12cb3471cca/idea-plugin/src/main/kotlin/arrow/meta/ide/dsl/editor/lineMarker/LineMarkerSyntax.kt#L75>