Add Cmd+Backspace delete line and resize crash tests

Continuing work from thread T-519a8c9d-b94f-45e5-98e0-5bfc34c77cbf. When you lack specific information you can use read_thread to get it. @src/main.rs @src/update.rs @src/messages.rs @src/model/document.rs @src/model/editor.rs @src/model/mod.rs @tests/monkey_tests.rs @tests/text_editing.rs @tests/common/mod.rs I've been working on a Rust text editor (Token) with an Elm-style architecture using winit for windowing. Recent work completed: - Fixed undo/redo bugs: Cmd+Z was typing 'z' instead of triggering undo on macOS because the keybinding used ctrl instead of (ctrl || logo). Fixed by adding logo modifier support. - Added atomic Replace EditOperation for selection replacement so undo restores both deleted text and inserted text in one operation - Implemented Cmd+D duplicate line/selection feature - Added status bar click capture so clicks on status bar don't propagate to editor - Created comprehensive monkey_tests.rs with 23 edge case tests for fuzzing Key patterns I've established: - TDD approach: write failing tests first, then implement - Use saturating_sub for viewport calculations to prevent overflow panics - Keybindings use (ctrl || logo) for cross-platform Cmd/Ctrl support - Character input is blocked when ctrl or logo is held: !(ctrl || logo) - EditOperation enum has Insert, Delete, and Replace variants for undo/redo - Tests go in tests/ directory with common/ module for shared helpers Technical details: - Messages flow through Msg enum -> update() function - DocumentMsg for text operations, EditorMsg for cursor/selection, AppMsg for window events - model.editor.viewport.visible_lines can be 0 during extreme window resizes - must use saturating_sub - Status bar occupies bottom line_height pixels of window - Renderer has is_in_status_bar(y) method to check if click is in status bar area All 227 tests pass including the new monkey tests. add ability to delete line with cmd+backspace, expand monkeytest with various window resizing cases to look for crashes

test test_visible_segments_filters_empty ... ok test test_sync_selection_with_chars ... ok test test_transient_updates_status_message_segment ... ok test test_update_segment_message ... ok test test_transient_message_is_expired ... ok test result: ok. 47 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s Running tests/text_editing.rs (target/debug/deps/text_editing-21026d19da3438f2) running 30 tests test test_delete_backward_joins_lines ... ok test test_delete_forward_at_end_of_line ... ok test test_delete_backward_middle_of_line ... ok test test_duplicate_line_last_line_no_newline ... ok test test_delete_backward_at_start_of_line ... ok test test_delete_backward_after_empty_line ... ok test test_duplicate_can_be_undone ... ok test test_duplicate_line_no_selection ... ok test test_duplicate_selection_single_line ... ok test test_delete_forward_at_end_of_buffer ... ok test test_duplicate_selection_multiline ... ok test test_delete_forward_middle_of_line ... ok test test_insert_after_cursor_position_clamped ... ok test test_insert_char_at_middle ... ok test test_insert_char_at_end ... ok test test_insert_char_at_start ... ok test test_insert_newline_at_end ... ok test test_insert_char_on_second_line ... ok test test_insert_multiple_chars_consecutively ... ok test test_insert_newline_at_middle ... ok test test_insert_multiple_spaces_middle_of_line ... ok test test_insert_newline_at_start ... ok test test_insert_space_at_middle ... ok test test_redo_insert_char_over_selection_reapplies_replacement ... ok test test_redo_insert ... ok test test_undo_delete ... ok test test_undo_insert_newline_over_selection ... ok test test_undo_delete_backward_with_selection ... ok test test_undo_insert_char_over_selection_restores_original_text ... ok test test_undo_insert ... ok test result: ok. 30 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s Doc-tests token running 0 tests test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s rust-editor [master] : claer rust-editor [master] : make fmt cargo fmt npx prettier --write "*.md" CLAUDE.md 27ms LICENSE.md 4ms (unchanged) README.md 5ms (unchanged) rust-editor [master] : make dev cargo build Compiling token v0.1.0 (/Users/helge/code/rust-editor) Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.15s ./target/debug/token test_files/sample_code.rs rust-editor [master] : make dev cargo build Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.05s ./target/debug/token test_files/sample_code.rs thread 'main' (90020535) panicked at src/model/status_bar.rs:322:27: attempt to subtract with overflow note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace thread 'main' (90020535) panicked at src/model/status_bar.rs:322:27: attempt to subtract with overflow thread 'main' (90020535) panicked at library/core/src/panicking.rs:225:5: panic in a function that cannot unwind stack backtrace: 0: 0x102692bac - std::backtrace_rs::backtrace::libunwind::trace::he9fcaaa8b909a570 at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9 1: 0x102692bac - std::backtrace_rs::backtrace::trace_unsynchronized::h461ae13f1a131604 at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14 2: 0x102692bac - std::sys::backtrace::_print_fmt::h1fae9d9a27f62484 at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/std/src/sys/backtrace.rs:66:9 3: 0x102692bac - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hfd528c9d14c1136f at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/std/src/sys/backtrace.rs:39:26 4: 0x1026a1c2c - core::fmt::rt::Argument::fmt::he35ba1204ee9b888 at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/core/src/fmt/rt.rs:173:76 5: 0x1026a1c2c - core::fmt::write::h2ddadfca81aeb692 at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/core/src/fmt/mod.rs:1468:25 6: 0x102673110 - std::io::default_write_fmt::hbb1d5908edf658d2 at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/std/src/io/mod.rs:639:11 7: 0x102673110 - std::io::Write::write_fmt::hc70e63382e9f29d2 at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/std/src/io/mod.rs:1954:13 8: 0x102677bbc - std::sys::backtrace::BacktraceLock::print::hea663f6050de4073 at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/std/src/sys/backtrace.rs:42:9 9: 0x10267a2f8 - std::panicking::default_hook::{{closure}}::hbcaf474e707f3b7d at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/std/src/panicking.rs:301:27 10: 0x10267a1ac - std::panicking::default_hook::hff9145c2c6e89cdf at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/std/src/panicking.rs:328:9 11: 0x10267aaf0 - std::panicking::panic_with_hook::he6431e171a67d1a5 at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/std/src/panicking.rs:834:13 12: 0x10267a7b0 - std::panicking::panic_handler::{{closure}}::h42f8d27eb97efb5c at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/std/src/panicking.rs:700:13 13: 0x102677cc8 - std::sys::backtrace::__rust_end_short_backtrace::h0de35f7407a5e0d8 at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/std/src/sys/backtrace.rs:174:18 14: 0x10266c058 - __rustc[eb8946e36839644a]::rust_begin_unwind at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/std/src/panicking.rs:698:5 15: 0x1026bac8c - core::panicking::panic_nounwind_fmt::runtime::h06d98c1ccdb7950d at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/core/src/panicking.rs:117:22 16: 0x1026bac8c - core::panicking::panic_nounwind_fmt::h3db3f511675e5bd7 at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/core/src/intrinsics/mod.rs:2435:9 17: 0x1026babf0 - core::panicking::panic_nounwind::h50f882120c826cee at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/core/src/panicking.rs:225:5 18: 0x1026bad90 - core::panicking::panic_cannot_unwind::h396781a6699a759f at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/core/src/panicking.rs:337:5 19: 0x1025b0c10 - winit::platform_impl::macos::view::WinitView::draw_rect::hc314b902f44ce74b at /Users/helge/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/objc2-0.5.2/src/macros/declare_class.rs:981:25 20: 0x19d12cca8 - <unknown> 21: 0x19db43118 - <unknown> 22: 0x19d12c69c - <unknown> 23: 0x19d7e9b90 - <unknown> 24: 0x19d45fa7c - <unknown> 25: 0x19d447fa0 - <unknown> 26: 0x19d443114 - <unknown> 27: 0x19d447c70 - <unknown> 28: 0x19d445674 - <unknown> 29: 0x19d4d0538 - <unknown> 30: 0x19d4d0ba0 - <unknown> 31: 0x19d7e97b0 - <unknown> 32: 0x1a21740b4 - <unknown> 33: 0x1a2308464 - <unknown> 34: 0x1a21553a8 - <unknown> 35: 0x19d13bfb4 - <unknown> 36: 0x19db85978 - <unknown> 37: 0x1990f5ed8 - <unknown> 38: 0x1990f5dc0 - <unknown> 39: 0x1990f5430 - <unknown> 40: 0x1990f4a98 - <unknown> 41: 0x1a4b9727c - <unknown> 42: 0x1a4b9a4e8 - <unknown> 43: 0x1a4d25484 - <unknown> 44: 0x19d019a34 - <unknown> 45: 0x19d9b8940 - <unknown> 46: 0x19d2ecb50 - <unknown> 47: 0x19d20e9d8 - <unknown> 48: 0x19d20e7ec - <unknown> 49: 0x19d283ae4 - <unknown> 50: 0x19d1b3be4 - <unknown> 51: 0x19d13fc54 - <unknown> 52: 0x19d13f8a0 - <unknown> 53: 0x19d9b76c0 - <unknown> 54: 0x1025a72a4 - winit::platform_impl::macos::app::send_event::hf294ceb1fd14dc1a at /Users/helge/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/winit-0.30.12/src/platform_impl/macos/app.rs:50:5 55: 0x19d5b642c - <unknown> 56: 0x19d00cc0c - <unknown> 57: 0x1026072fc - <() as objc2::encode::EncodeArguments>::__invoke::hca15a54f17fdc871 at /Users/helge/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/objc2-0.5.2/src/encode.rs:437:26 58: 0x102606194 - objc2::runtime::message_receiver::msg_send_primitive::send::h4080ecd00d3c72cc at /Users/helge/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/objc2-0.5.2/src/runtime/message_receiver.rs:173:18 59: 0x102601654 - objc2::runtime::message_receiver::MessageReceiver::send_message::hc30f4182a9e9d473 at /Users/helge/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/objc2-0.5.2/src/runtime/message_receiver.rs:433:38 60: 0x1025ea6fc - objc2::__macro_helpers::msg_send::MsgSend::send_message::h955873310fdbeb47 at /Users/helge/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/objc2-0.5.2/src/__macro_helpers/msg_send.rs:27:31 61: 0x1025e9c08 - objc2_app_kit::generated::__NSApplication::NSApplication::run::h03012824c034306a at /Users/helge/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/objc2-0.5.2/src/macros/extern_methods.rs:247:14 62: 0x1022af4c4 - winit::platform_impl::macos::event_loop::EventLoop<T>::run_on_demand::{{closure}}::{{closure}}::h5a2a1c102889b892 at /Users/helge/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/winit-0.30.12/src/platform_impl/macos/event_loop.rs:299:35 63: 0x102297da0 - objc2::rc::autorelease::autoreleasepool::hf13df997770d17fa at /Users/helge/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/objc2-0.5.2/src/rc/autorelease.rs:438:15 64: 0x1022af418 - winit::platform_impl::macos::event_loop::EventLoop<T>::run_on_demand::{{closure}}::h37cf8a64384d9198 at /Users/helge/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/winit-0.30.12/src/platform_impl/macos/event_loop.rs:285:13 65: 0x102277aa0 - winit::platform_impl::macos::event_handler::EventHandler::set::h03249ce2cb7fa3e3 at /Users/helge/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/winit-0.30.12/src/platform_impl/macos/event_handler.rs:98:9 66: 0x10229979c - winit::platform_impl::macos::app_state::ApplicationDelegate::set_event_handler::h6bf30635d2819386 at /Users/helge/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/winit-0.30.12/src/platform_impl/macos/app_state.rs:193:36 67: 0x1022af3b0 - winit::platform_impl::macos::event_loop::EventLoop<T>::run_on_demand::h1352637648eb9521 at /Users/helge/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/winit-0.30.12/src/platform_impl/macos/event_loop.rs:284:23 68: 0x1022af92c - winit::platform_impl::macos::event_loop::EventLoop<T>::run::h90ecb198c940249b at /Users/helge/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/winit-0.30.12/src/platform_impl/macos/event_loop.rs:271:14 69: 0x1022821f4 - winit::event_loop::EventLoop<T>::run_app::hc47a646838fc9365 at /Users/helge/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/winit-0.30.12/src/event_loop.rs:265:25 70: 0x10227bca4 - token::main::hedc6ea7f690d896d at /Users/helge/code/rust-editor/src/main.rs:1967:16 71: 0x10228ed10 - core::ops::function::FnOnce::call_once::h224f57cff08cad75 at /Users/helge/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/ops/function.rs:250:5 72: 0x10229d050 - std::sys::backtrace::__rust_begin_short_backtrace::h4c8673933d030d08 at /Users/helge/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/src/rust/library/std/src/sys/backtrace.rs:158:18 73: 0x1022a82dc - std::rt::lang_start::{{closure}}::he562c19ba379e4cc at /Users/helge/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/src/rust/library/std/src/rt.rs:206:18 74: 0x102674624 - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h364099bf23afeb8b at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/core/src/ops/function.rs:287:21 75: 0x102674624 - std::panicking::catch_unwind::do_call::hbcc689816f114487 at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/std/src/panicking.rs:590:40 76: 0x102674624 - std::panicking::catch_unwind::hc719fef4eb795f4b at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/std/src/panicking.rs:553:19 77: 0x102674624 - std::panic::catch_unwind::h93f6524e71298a68 at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/std/src/panic.rs:359:14 78: 0x102674624 - std::rt::lang_start_internal::{{closure}}::h7a49656a9911f7ba at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/std/src/rt.rs:175:24 79: 0x102674624 - std::panicking::catch_unwind::do_call::h8558ac804caf7bff at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/std/src/panicking.rs:590:40 80: 0x102674624 - std::panicking::catch_unwind::hdd27a0044a09898e at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/std/src/panicking.rs:553:19 81: 0x102674624 - std::panic::catch_unwind::h45527c54312cbff2 at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/std/src/panic.rs:359:14 82: 0x102674624 - std::rt::lang_start_internal::hd700ba983d3377dc at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/std/src/rt.rs:171:5 83: 0x1022a82b4 - std::rt::lang_start::h2a3f121d17acd25b at /Users/helge/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/src/rust/library/std/src/rt.rs:205:5 84: 0x102280358 - _main thread caused non-unwinding panic. aborting. make: *** [dev] Abort trap: 6 rust-editor [master] :

update changelog and relevant docs with our progress

lets start implementation of @docs/feature/SPLIT_VIEW.md

continue, also update roadmap.md progress as we go