Helix crash on Ctrl-o

[Zoybean]

Summary

When pressing ctrl-o after deleting selection contents, helix crashes.

thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Char index out of bounds: char index 1794223, Rope/RopeSlice char length 1776214', C:\Users\runneradmin\.cargo\registry\src\github.com-1ecc6299db9ec823\ropey-1.4.1\src\slice.rs:349:41
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Reproduction Steps

I tried this:

1. select the whole file
2. select some subset of the file, and delete that subset
3. press ctrl-o

I expected this to happen:

• Either an error message, or the previously selected region of the file is reselected

Instead, this happened:

• helix crashed

Helix log

No log available

Platform

Windows 10

Terminal Emulator

ConEmu 160914 [64] {Stable}

Helix Version

helix 22.03 (d4e45fd)

[pickfire]

I noticed it too but I don't have exact step to reproduce, basically I just press ctrl-o many times (across different files and edits) when editing halfway then it crashed.

[the-mikedavis]

There was a similar panic fixed in #1397 around jumping to a buffer that was closed with :buffer-close (#2107). For this one

Char index out of bounds: char index 1794223, Rope/RopeSlice char length 1776214

we might be able to reproduce by saving to the jumplist at the end of a file and then shortening the file by deleting some lines and jumping backwards.

[archseer]

This indeed looks like #2107 so it should be addressed on latest master (but not 22.03).

[pickfire]

This indeed looks like #2107 so it should be addressed on latest master (but not 22.03).

I just faced it last week on latest master, but the issue I faced with ctrl-o could be a different issue.

[David-Else]

I just had this on pressing ctrl-o:

thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Char index out of bounds: char index 4081, Rope/RopeSlice char length 4079', /home/david/.cargo/registry/src/github.com-1ecc6299db9ec823/ropey-1.5.0/src/slice.rs:349:41
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

helix 22.08.1 (038ad62)

[softmoth]

I was able to repeat this on master (9b7f349). Here is a backtrace:

RUST_BACKTRACE=1 ./target/debug/hx README.md

  87 oin·`#helix-editor:matrix.org`·if·you're·on·a·client·that·doesn't·support·Matrix·Spaces·yet).thread 'main' panicked at 'assertion failed: char_idx <= slice.len_chars()', helix-core/src/graphemes.rs:37:5
stack backtrace:
 0: rust_begin_unwind
           at /rustc/c2804e6ec2c29a5c7368600ea173b890e2655c3d/library/std/src/panicking.rs:584:5
 1: core::panicking::panic_fmt
           at /rustc/c2804e6ec2c29a5c7368600ea173b890e2655c3d/library/core/src/panicking.rs:142:14
 2: core::panicking::panic
           at /rustc/c2804e6ec2c29a5c7368600ea173b890e2655c3d/library/core/src/panicking.rs:48:5
 3: helix_core::graphemes::nth_prev_grapheme_boundary
           at ./helix-core/src/graphemes.rs:37:5
 4: helix_core::graphemes::prev_grapheme_boundary
           at ./helix-core/src/graphemes.rs:79:5
 5: helix_core::graphemes::ensure_grapheme_boundary_prev
           at ./helix-core/src/graphemes.rs:194:9
 6: helix_core::selection::Range::grapheme_aligned
           at ./helix-core/src/selection.rs:271:17
 7: helix_core::selection::Selection::ensure_invariants::{{closure}}
           at ./helix-core/src/selection.rs:561:28
 8: helix_core::selection::Selection::transform
           at ./helix-core/src/selection.rs:549:22
 9: helix_core::selection::Selection::ensure_invariants
           at ./helix-core/src/selection.rs:561:9
10: helix_view::document::Document::set_selection                                         1 sel  87:210
           at ./helix-view/src/document.rs:704:30
11: helix_term::commands::jump_forward
           at ./helix-term/src/commands.rs:4116:9
12: helix_term::commands::MappableCommand::execute
           at ./helix-term/src/commands.rs:177:41
13: helix_term::ui::editor::EditorView::handle_keymap_event::{{closure}}
           at ./helix-term/src/ui/editor.rs:899:13
14: helix_term::ui::editor::EditorView::handle_keymap_event
           at ./helix-term/src/ui/editor.rs:932:17
15: helix_term::ui::editor::EditorView::command_mode
           at ./helix-term/src/ui/editor.rs:1024:17
16: <helix_term::ui::editor::EditorView as helix_term::compositor::Component>::handle_event
           at ./helix-term/src/ui/editor.rs:1367:33
17: helix_term::compositor::Compositor::handle_event
           at ./helix-term/src/compositor.rs:172:19
18: helix_term::application::Application::handle_terminal_events
           at ./helix-term/src/application.rs:467:22
19: helix_term::application::Application::event_loop_until_idle::{{closure}}
           at ./helix-term/src/application.rs:292:21
20: <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll
           at /rustc/c2804e6ec2c29a5c7368600ea173b890e2655c3d/library/core/src/future/mod.rs:91:19
21: helix_term::application::Application::event_loop::{{closure}}
           at ./helix-term/src/application.rs:268:57
22: <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll
           at /rustc/c2804e6ec2c29a5c7368600ea173b890e2655c3d/library/core/src/future/mod.rs:91:19
23: helix_term::application::Application::run::{{closure}}
           at ./helix-term/src/application.rs:872:38
24: <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll
           at /rustc/c2804e6ec2c29a5c7368600ea173b890e2655c3d/library/core/src/future/mod.rs:91:19
25: hx::main_impl::{{closure}}
           at ./helix-term/src/main.rs:145:53
26: <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll
           at /rustc/c2804e6ec2c29a5c7368600ea173b890e2655c3d/library/core/src/future/mod.rs:91:19
27: tokio::park::thread::CachedParkThread::block_on::{{closure}}
           at /home/trs/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.21.2/src/park/thread.rs:267:54
28: tokio::coop::with_budget::{{closure}}
           at /home/trs/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.21.2/src/coop.rs:102:9
29: std::thread::local::LocalKey<T>::try_with
           at /rustc/c2804e6ec2c29a5c7368600ea173b890e2655c3d/library/std/src/thread/local.rs:445:16
30: std::thread::local::LocalKey<T>::with
           at /rustc/c2804e6ec2c29a5c7368600ea173b890e2655c3d/library/std/src/thread/local.rs:421:9
31: tokio::coop::with_budget
           at /home/trs/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.21.2/src/coop.rs:95:5
32: tokio::coop::budget
           at /home/trs/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.21.2/src/coop.rs:72:5
33: tokio::park::thread::CachedParkThread::block_on
           at /home/trs/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.21.2/src/park/thread.rs:267:31
34: tokio::runtime::enter::Enter::block_on
           at /home/trs/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.21.2/src/runtime/enter.rs:152:13
35: tokio::runtime::scheduler::multi_thread::MultiThread::block_on
           at /home/trs/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.21.2/src/runtime/scheduler/multi_thread/mod.rs:79:9
36: tokio::runtime::Runtime::block_on
           at /home/trs/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.21.2/src/runtime/mod.rs:492:44
37: hx::main_impl
           at ./helix-term/src/main.rs:147:5
38: hx::main
           at ./helix-term/src/main.rs:37:21
39: core::ops::function::FnOnce::call_once
           at /rustc/c2804e6ec2c29a5c7368600ea173b890e2655c3d/library/core/src/ops/function.rs:248:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

I typed %s\n<Enter>c THE END<Enter> and then hit C-o and C-i several times. I can't seem to repeat it consistently, though.

[jtrees]

Thanks so much for fixing this. Any chance we could get a bugfix release with the changes?

[zuixalias]

thread 'main' panicked at 'called 'Result::unwrap()' on an 'Err' value: Char index out of bounds: char index 14025, Rope/RopeSlice char length 14014', C:\Users\runneradmin\.cargo\registry\src\github.com-1ecc6299db9ec823\ropey-1.5.1-alpha\src\slice.rs:360:41

I have encountered this or a similar crash multiple time across multiple helix versions.
I was editing and got it again, not sure what the trigger was though.

Helix Version: helix 22.12 (96ff64a8)

[pascalkuthe]

thread 'main' panicked at 'called 'Result::unwrap()' on an 'Err' value: Char index out of bounds: char index 14025, Rope/RopeSlice char length 14014', C:\Users\runneradmin\.cargo\registry\src\github.com-1ecc6299db9ec823\ropey-1.5.1-alpha\src\slice.rs:360:41

I have encountered this or a similar crash multiple time across multiple helix versions. I was editing and got it again, not sure what the trigger was though.

Helix Version: helix 22.12 (96ff64a8)

I have not encountered this ever since it was fixed. The ubderlying problem was definitly fixed. If you can provide a reproduction case or a backtrace (ideally both) with the new version open a new issues

[zuixalias]

Okay, will keep that in mind.
(btw the key bind that triggered it was most probably not the one mentioned in the title of this issue...also, i think it was in Insert mode)