ShowTabNavigation twice -> panic

[octavz]

Describe the bug

Pressed the shortcut for ShowTabNavigation twice and got this:

C:\Program Files\WezTerm> .\wezterm.exe
2021-03-15T07:59:23.148Z INFO wezterm_mux_server_impl::local > setting up C:\Users\Octav.local/share/wezterm\gui-sock-16200
2021-03-15T07:59:23.289Z INFO wezterm_gui::termwindow > OpenGL initialized! ANGLE (Intel(R) UHD Graphics Direct3D11 vs_5_0 ps_5_0) OpenGL ES 3.0.0 (ANGLE 2.1.1 git hash: 07ea804e6201) is_context_loss_possible=true wezterm version: 20210314-114017-04b7cedd
thread 'main' panicked at 'already borrowed: BorrowMutError', mux\src\lib.rs:364:44
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace
2021-03-15T07:59:27.479Z ERROR window::os::windows::window > caught Any

Environment (please complete the following information):

Windows 10

[wez]

Thanks for reporting this! I've pushed a fix for this; it'll show up in the nightly builds within the hour

[github-actions]

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