Fix Style Store Crash

Author: thecoolwinter

Sources/CodeEditSourceEditor/Highlighting/StyledRangeContainer/StyledRangeContainer.swift

@@ -45,6 +45,31 @@ class StyledRangeContainer {
         }
     }
 
+    enum RunState {
+        case empty
+        case value(RangeStoreRun<StyleElement>)
+        case exhausted
+
+        var isExhausted: Bool {
+            if case .exhausted = self { return true }
+            return false
+        }
+
+        var hasValue: Bool {
+            if case .value = self { return true }
+            return false
+        }
+
+        var length: Int {
+            switch self {
+            case .empty, .exhausted:
+                return 0
+            case .value(let run):
+                return run.length
+            }
+        }
+    }
+
     var _storage: [ProviderID: RangeStore<StyleElement>] = [:]
     weak var delegate: StyledRangeContainerDelegate?
 
@@ -98,6 +123,11 @@ class StyledRangeContainer {
         var minValue = allRuns.compactMap { $0.last }.enumerated().min(by: { $0.1.length < $1.1.length })
 
         while let value = minValue {
+            // Early return if all arrays are empty
+            guard allRuns.contains(where: { !$0.isEmpty }) else {
+                return runs.reversed()
+            }
+
             // Get minimum length off the end of each array
             let minRunIdx = value.offset
             var minRun = value.element

Sources/CodeEditSourceEditor/SourceEditor/SourceEditor.swift

@@ -149,7 +149,8 @@ public struct SourceEditor: NSViewControllerRepresentable {
             controller.setCursorPositions(cursorPositions)
         }
 
-        if let scrollPosition = state.scrollPosition, scrollPosition != state.scrollPosition {
+        let scrollView = controller.scrollView
+        if let scrollPosition = state.scrollPosition, scrollPosition != scrollView?.contentView.bounds.origin {
             controller.scrollView.scroll(controller.scrollView.contentView, to: scrollPosition)
             controller.scrollView.reflectScrolledClipView(controller.scrollView.contentView)
             controller.gutterView.needsDisplay = true