LSP: live preview crashes in v1.16.1 and v1.17.0

### Bug Description # Bug description The live preview crashes when opening a certain component. Both v1.16.1 and v1.17.0 seem to be affected. It seems to be a stack overflow in both cases. LSP logs for v1.16.1: ``` thread 'main' (41556) has overflowed its stack 2026-06-25T22:12:21.586608Z ERROR slint_lsp::preview::connector::native: The Slint live preview crashed! Please open a bug on the [Slint bug tracker](https://github.com/slint-ui/slint/issues). ``` LSP logs for v1.17.0: ``` thread 'main' (35952) has overflowed its stack 2026-06-25T22:16:59.125856Z ERROR slint_lsp::preview::connector::native: The Slint live preview crashed! Please open a bug on the [Slint bug tracker](https://github.com/slint-ui/slint/issues). ``` # How to reproduce 1. Install the Slint LSP & environment - This probably does not make a difference, but for completeness' sake - Install the Slint extension v1.16.1 for Zed (1.x) - Install the Slint LSP with `cargo install --debug --force slint-lsp@1.17.0` - Configure the LSP extension to use `slint-lsp.exe` from cargo's bin folder - Launch Zed 2. Open [sed_manager_gui_slint.zip](https://github.com/user-attachments/files/29359534/sed_manager_gui_slint.zip)/ui/main_window.slint:`MainWindow` in the live preview 3. Click "Configure locking" as indicated on the image 4. The LSP crashes with a stack overflow (at least for me) <img width="626" height="485" alt="Image" src="https://github.com/user-attachments/assets/5799074d-797e-4f5b-9638-9fa20a492e27" /> # Additional information ## Running from Rust The crash only occurs in the LSP live preview, but not when compiling the Slint components and running it from a Rust host application. Extract from `Cargo.lock`: ``` [[package]] name = "slint" version = "1.17.0" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "a54a407d1a0cbaa71d830ae7c236064b171368ea18db3b51ea3f2ce3f19519ee" dependencies = [ "...", ] ``` ## Minimal repro Feel free to get back to me in case you need a **minimal** repro. Including the entire source code saves me time, but I understand it may be less helpful for you. ### Reproducible Code (if applicable) ```slint ``` ### Environment Details - Slint Version: v1.16.1 and v1.17.0 (LSP) - Platform/OS: Windows 11 25H2 - Programming Language: Slint (Rust not involved) - Backend/Renderer: LSP default ### Product Impact _No response_