Introduce the SelectionSet type

README.md

@@ -74,7 +74,6 @@ extension KeyModifierFlags {
 }
 
 open class MultiCursorTextView: NSTextView {
-    // this is a retain cycle, but it's convenient
     private lazy var coordinator = TextSystemCursorCoordinator(
         textView: self,
         system: IBeamTextViewSystem(textView: self)

Sources/IBeam/MultiCursorState.swift

@@ -65,6 +65,11 @@ public final class MultiCursorState<System: TextSystem> {
 	public var textSystem: System {
 		processor.textSystem
 	}
+
+	public var cursorSet: CursorSet<TextRange> {
+		// this is very inefficient
+		CursorSet(ranges: cursors.map({ $0.textRange }))
+	}
 }
 
 extension MultiCursorState {

Sources/IBeam/SelectionSet.swift

@@ -0,0 +1,11 @@
+public struct CursorSet<TextRange> {
+	public let ranges: [TextRange]
+
+	public init(ranges: [TextRange] = []) {
+		self.ranges = ranges
+	}
+}
+
+extension CursorSet: Equatable where TextRange: Equatable {}
+extension CursorSet: Hashable where TextRange: Hashable {}
+extension CursorSet: Sendable where TextRange: Sendable {}