Anthony Eid
ab913c96c6
Closes [#58343](<https://github.com/zed-industries/zed/issues/58343>) This crash happened because Helix paste restored selection using the raw clipboard text length, but buffer edits normalize CRLF line endings to LF before inserting. When pasting CRLF text at or near EOF, the restored selection could extend past the normalized snapshot length and panic in `MutableSelectionsCollection::select_ranges`. The fix normalizes the text before measuring it for selection restoration and adds regression coverage for CRLF paste in Helix mode. Self-Review Checklist: - [X] I've reviewed my own diff for quality, security, and reliability - [X] Unsafe blocks (if any) have justifying comments - [X] The content is consistent with the [UI/UX checklist](<https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist>) - [X] Tests cover the new/changed behavior - [X] Performance impact has been considered and is acceptable Release Notes: - Fixed a crash that could occur when pasting at the end of a file in Helix mode
This contains the code for Zed's Vim emulation mode.
Vim mode in Zed is supposed to primarily "do what you expect": it mostly tries to copy vim exactly, but will use Zed-specific functionality when available to make things smoother. This means Zed will never be 100% vim compatible, but should be 100% vim familiar!
The backlog is maintained in the #vim channel notes.
Testing against Neovim
If you are making a change to make Zed's behavior more closely match vim/nvim, you can create a test using the NeovimBackedTestContext.
For example, the following test checks that Zed and Neovim have the same behavior when running * in visual mode:
#[gpui::test]
async fn test_visual_star_hash(cx: &mut gpui::TestAppContext) {
let mut cx = NeovimBackedTestContext::new(cx).await;
cx.set_shared_state("ˇa.c. abcd a.c. abcd").await;
cx.simulate_shared_keystrokes(["v", "3", "l", "*"]).await;
cx.assert_shared_state("a.c. abcd ˇa.c. abcd").await;
}
To keep CI runs fast, by default the neovim tests use a cached JSON file that records what neovim did (see crates/vim/test_data), but while developing this test you'll need to run it with the neovim flag enabled:
cargo test -p vim --features neovim test_visual_star_hash
This will run your keystrokes against a headless neovim and cache the results in the test_data directory. Note that neovim must be installed and reachable on your $PATH in order to run the feature.
Testing zed-only behavior
Zed does more than vim/neovim in their default modes. The VimTestContext can be used instead. This lets you test integration with the language server and other parts of zed's UI that don't have a NeoVim equivalent.