codemirror-shadow-1/src/line/saw_special_spans.js

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// Optimize some code when these features are not used.
export let sawReadOnlySpans = false, sawCollapsedSpans = false

export function seeReadOnlySpans() {
  sawReadOnlySpans = true
}

export function seeCollapsedSpans() {
  sawCollapsedSpans = true
}