Fix Style Store Crash (#345)

### Description

Fixes a crash when the styled range store has empty arrays and still
tries to remove values.

### Related Issues

N/A

### Checklist

- [x] I read and understood the [contributing
guide](https://github.com/CodeEditApp/CodeEdit/blob/main/CONTRIBUTING.md)
as well as the [code of
conduct](https://github.com/CodeEditApp/CodeEdit/blob/main/CODE_OF_CONDUCT.md)
- [x] The issues this PR addresses are related to each other
- [x] My changes generate no new warnings
- [x] My code builds and runs on my machine
- [x] My changes are all related to the related issue above
- [x] I documented my code

### Screenshots

N/A

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?
 
@@ -118,7 +143,9 @@ class StyledRangeContainer {
                 }
             }
 
-            allRuns[minRunIdx].removeLast()
+            if !allRuns[minRunIdx].isEmpty {
+                allRuns[minRunIdx].removeLast()
+            }
 
             runs.append(minRun)
             minValue = allRuns.compactMap { $0.last }.enumerated().min(by: { $0.1.length < $1.1.length })

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