Typing using a Thai keyboard causes a crash

**Describe the bug** Using a Thai keyboard with SwiftTerm on iOS causes the entire app to crash after a few key press **To Reproduce** - start an app on iOS using SwiftTerm (for example the AppStore version of a-Shell mini, but any app will do) - switch to the "5 rows" keyboard for the Thai language (iOS 26) or the single Thai keyboard (iPadOS 18), - start typing randomly - after two-three keys, the application crashes. According to the debugger, the issue happens in: ```swift private func commitTextInput(_ text: String, applyModifiers: Bool) ``` at the following line: ```swift textInputStorage.replaceSubrange(rangeToReplace.fullRange(in: textInputStorage), with: textToInsert) ``` with the error: Fatal error: String index is out of bounds. I suspect Thai is similar to the Korean language (multiple characters being combined into one), but I haven't found a tutorial yet. A user left the following AppStore review: "อัพเดทแล้วแป้นพิมพ์สลับเองตอนกด enter ทำให้เกิดข้อผิดพลาดบ่อย", which was translated as: "After the update, the keyboard switches automatically when pressing enter, causing frequent errors". I haven't been able to reproduce that one. It's possible that they use a custom keyboard defined in an app, there are several popular apps for Thai keyboards. **Expected behavior** I would expect to be able to type using a Thai keyboard, without crashing. **Smartphone (please complete the following information):** - Device: iPad Pro and iPhone SE - OS: iPadOS 16 and iOS 26