macOS: BorrowMut error when doing stuff in mapping panel while text field still focused

[helgoboss]

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REAPER version:      6.26/OSX64
Module name:         ReaLearn
Module version:      v2.8.0-rc.5/x86_64 rev 84f6eb (2021-04-15 18:58:23 UTC)
Module base address: -
Module size:         -

Message: already borrowed: BorrowMutError

   0:        0x115394eac - backtrace::backtrace::trace::h701fede425395a59
   1:        0x11537e1da - backtrace::capture::Backtrace::new::h39ae1fc35860ce55
   2:        0x115269cb9 - reaper_high::log_util::create_reaper_panic_hook::{{closure}}::h3de3bc4191e19432
   3:        0x1153c4a8e - std::panicking::rust_panic_with_hook::hbb70e1d25c7381a9
   4:        0x1153c4595 - std::panicking::begin_panic_handler::{{closure}}::hb72eee9aad2e147c
   5:        0x1153c2418 - std::sys_common::backtrace::__rust_end_short_backtrace::h372ff87ecb2667f3
   6:        0x1153c44fa - _rust_begin_unwind
   7:        0x11541642f - core::panicking::panic_fmt::h261fd45d36f74dfa
   8:        0x115416335 - core::result::unwrap_failed::h0599975464fe37ac
   9:        0x114ea234e - <realearn::infrastructure::ui::mapping_panel::MappingPanel as swell_ui::view::View>::edit_control_focus_killed::h3aa9e5d7a412196f
  10:        0x115215482 - std::thread::local::LocalKey<T>::with::h2e00c30c2f957f9b
  11:        0x11521361c - swell_ui::view_manager::view_dialog_proc::h847968e9561da010
  12:        0x1009def36 - __ZL28SwellDialogDefaultWindowProcP6HWND__jml
  13:     0x7fff20453895 - <unknown>
  14:     0x7fff204ef224 - <unknown>
  15:     0x7fff204ef1a7 - <unknown>
  16:     0x7fff20424546 - <unknown>
  17:     0x7fff210c8abe - <unknown>
  18:     0x7fff22e9ab20 - <unknown>
  19:     0x7fff20453895 - <unknown>
  20:     0x7fff204ef224 - <unknown>
  21:     0x7fff204ef1a7 - <unknown>
  22:     0x7fff20424546 - <unknown>
  23:     0x7fff210c8abe - <unknown>
  24:     0x7fff22e9a6c5 - <unknown>
  25:     0x7fff22cec253 - <unknown>
  26:        0x1009fed46 - __Z10ShowWindowP6HWND__i
  27:        0x114e8998e - realearn::infrastructure::ui::mapping_panel::ImmutableMappingPanel::invalidate_mode_controls::h657645b4166c1643
  28:        0x114e7426f - realearn::infrastructure::ui::mapping_panel::MappingPanel::read::h82f7dcfc69a59360
  29:        0x114de663b - <alloc::rc::Rc<core::cell::RefCell<S>> as rxrust::observer::Observer<Item,Err>>::next::h8660e2e5f6f2201e
  30:        0x114f7631a - <rxrust::subscriber::Subscriber<O,U> as rxrust::observer::Observer<Item,Err>>::next::h8e85bcf7894ac28e
  31:        0x114dc8a5e - <alloc::vec::Vec<T> as rxrust::observer::Observer<Item,Err>>::next::hed5b4b953ba363fb
  32:        0x114c444e2 - core::ops::function::FnOnce::call_once{{vtable.shim}}::ha8eed02011496d27
  33:        0x1152808fe - reaper_high::main_task_middleware::MainTaskMiddleware::run::hec31081c0ae217a9
  34:        0x114fd5049 - realearn::domain::control_surface::RealearnControlSurfaceMiddleware<EH>::run_internal::hd3658f2b5b172ef8
  35:        0x1152d6107 - _Run
  36:        0x100827311 - __Z9CSurf_Runv
  37:        0x1005b3c90 - __Z13runMiscTimersv
  38:        0x10061ae89 - __Z12Main_OnTimerP6HWND__m
  39:        0x100b4539a - __Z8MainProcP6HWND__jml
  40:        0x1009def36 - __ZL28SwellDialogDefaultWindowProcP6HWND__jml
  41:     0x7fff2116050f - <unknown>
  42:     0x7fff204772c9 - <unknown>
  43:     0x7fff20476d95 - <unknown>
  44:     0x7fff204768e8 - <unknown>
  45:     0x7fff2045ceaf - <unknown>
  46:     0x7fff2045bfe2 - <unknown>
  47:     0x7fff2892a630 - <unknown>
  48:     0x7fff2892a42c - <unknown>
  49:     0x7fff2892a14f - <unknown>
  50:     0x7fff22bb19b1 - <unknown>
  51:     0x7fff22bb0177 - <unknown>
  52:     0x7fff22ba268a - <unknown>
  53:     0x7fff22b7696f - <unknown>
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