thread 'main' panicked at 'assertion failed: self.len_after == other.len', helix-core/src/transaction.rs:127:9
stack backtrace:
   0: rust_begin_unwind
             at /rustc/9bc8c42bb2f19e745a63f3445f1ac248fb015e53/library/std/src/panicking.rs:493:5
   1: core::panicking::panic_fmt
             at /rustc/9bc8c42bb2f19e745a63f3445f1ac248fb015e53/library/core/src/panicking.rs:92:14
   2: core::panicking::panic
             at /rustc/9bc8c42bb2f19e745a63f3445f1ac248fb015e53/library/core/src/panicking.rs:50:5
   3: helix_core::transaction::ChangeSet::compose
             at ./helix-core/src/transaction.rs:127:9
   4: helix_view::document::Document::apply::{{closure}}
             at ./helix-view/src/document.rs:331:17
   5: helix_view::document::take_with::{{closure}}
             at ./helix-view/src/document.rs:61:68
   6: <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
             at /home/ivan/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panic.rs:344:9
   7: std::panicking::try::do_call
             at /home/ivan/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:379:40
   8: __rust_try
   9: std::panicking::try
             at /home/ivan/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:343:19
  10: std::panic::catch_unwind
             at /home/ivan/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panic.rs:431:14
  11: helix_view::document::take_with
             at ./helix-view/src/document.rs:61:21
  12: helix_view::document::Document::apply
             at ./helix-view/src/document.rs:330:13
  13: hx::commands::insert::insert_char
             at ./helix-term/src/commands.rs:1613:17
  14: hx::ui::editor::EditorView::insert_mode
             at ./helix-term/src/ui/editor.rs:476:13
  15: <hx::ui::editor::EditorView as hx::compositor::Component>::handle_event
             at ./helix-term/src/ui/editor.rs:579:33
  16: hx::compositor::Compositor::handle_event
             at ./helix-term/src/compositor.rs:112:19
  17: hx::application::Application::handle_terminal_events
             at ./helix-term/src/application.rs:132:32
  18: hx::application::Application::event_loop::{{closure}}
             at ./helix-term/src/application.rs:96:21
  19: <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll
             at /home/ivan/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/future/mod.rs:80:19
  20: hx::application::Application::run::{{closure}}
             at ./helix-term/src/application.rs:254:9
  21: <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll
             at /home/ivan/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/future/mod.rs:80:19
  22: hx::main::{{closure}}
             at ./helix-term/src/main.rs:121:5
  23: <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll
             at /home/ivan/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/future/mod.rs:80:19
  24: tokio::park::thread::CachedParkThread::block_on::{{closure}}
             at /home/ivan/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.6.1/src/park/thread.rs:263:54
  25: tokio::coop::with_budget::{{closure}}
             at /home/ivan/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.6.1/src/coop.rs:106:9
  26: std::thread::local::LocalKey<T>::try_with
             at /home/ivan/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/local.rs:272:16
  27: std::thread::local::LocalKey<T>::with
             at /home/ivan/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/local.rs:248:9
  28: tokio::coop::with_budget
             at /home/ivan/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.6.1/src/coop.rs:99:5
  29: tokio::coop::budget
             at /home/ivan/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.6.1/src/coop.rs:76:5
  30: tokio::park::thread::CachedParkThread::block_on
             at /home/ivan/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.6.1/src/park/thread.rs:263:31
  31: tokio::runtime::enter::Enter::block_on
             at /home/ivan/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.6.1/src/runtime/enter.rs:151:13
  32: tokio::runtime::thread_pool::ThreadPool::block_on
             at /home/ivan/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.6.1/src/runtime/thread_pool/mod.rs:71:9
  33: tokio::runtime::Runtime::block_on
             at /home/ivan/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.6.1/src/runtime/mod.rs:452:43
  34: hx::main
             at ./helix-term/src/main.rs:123:5
  35: core::ops::function::FnOnce::call_once
             at /home/ivan/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:227:5