Update text in updateNSViewController when binding changes externally

Author: quicklywilliam

Sources/CodeEditSourceEditor/SourceEditor/SourceEditor.swift

@@ -138,6 +138,10 @@ public struct SourceEditor: NSViewControllerRepresentable {
         if context.coordinator.isUpdateFromTextView {
             context.coordinator.isUpdateFromTextView = false
         } else {
+            // Update text if it changed externally (e.g. switching files)
+            if case .binding(let binding) = text, controller.textView.string != binding.wrappedValue {
+                controller.textView.setText(binding.wrappedValue)
+            }
             context.coordinator.isUpdatingFromRepresentable = true
             updateControllerWithState(state, controller: controller)
             context.coordinator.isUpdatingFromRepresentable = false