jnml@3900x:~$ panic: code=.tnotebook3 select -1 -> r= err=Managed window index "-1" out of bounds
goroutine 1 [running, locked to thread]:
modernc.org/tk9%2e0.fail(...)
/home/jnml/pkg/mod/modernc.org/tk9.0@v0.55.3/tk.go:418
modernc.org/tk9%2e0.evalErr({0xc0003266f0, 0x15})
/home/jnml/pkg/mod/modernc.org/tk9.0@v0.55.3/tk.go:405 +0x337
modernc.org/tk9%2e0.(*TNotebookWidget).Select(0xc0001d2000, {0x601dc0?, 0xc000307bd0?})
/home/jnml/pkg/mod/modernc.org/tk9.0@v0.55.3/tk.go:5452 +0x10d
main.(*app).selectToolbox(...)
/home/jnml/pkg/mod/modernc.org/equ@v1.1.0/gui.go:146
main.(*app).selectPriorToolbox(...)
/home/jnml/pkg/mod/modernc.org/equ@v1.1.0/gui.go:140
modernc.org/tk9%2e0.newEventHandler.func1(0x60d660?)
/home/jnml/pkg/mod/modernc.org/tk9.0@v0.55.3/tk.go:618 +0x13
modernc.org/tk9%2e0.eventDispatcher(0x1?, 0x1?, 0x2, 0x1e98c60)
/home/jnml/pkg/mod/modernc.org/tk9.0@v0.55.3/tk_purego.go:313 +0x323
reflect.Value.call({0x60eb40?, 0x752738?, 0xc0000cb498?}, {0x658cb9, 0x4}, {0xc000329f20, 0x4, 0xc000329f20?})
/usr/local/go/src/reflect/value.go:581 +0xca6
reflect.Value.Call({0x60eb40?, 0x752738?, 0x7fff4cdb8588?}, {0xc000329f20?, 0xc0003f69c0?, 0x0?})
/usr/local/go/src/reflect/value.go:365 +0xb9
github.com/ebitengine/purego.callbackWrap(0x7fff4cdb84d8)
/home/jnml/pkg/mod/github.com/ebitengine/purego@v0.8.0/syscall_sysv.go:178 +0x3ab
github.com/ebitengine/purego.syscall_syscall15X(0x7fcfc8c4a0e0, 0x1e8cbf0, 0x7fcf9f4013b0, 0xf, 0x40000, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
/home/jnml/pkg/mod/github.com/ebitengine/purego@v0.8.0/syscall_sysv.go:24 +0x1e5
github.com/ebitengine/purego.SyscallN(0x7fcfc8c4a0e0, {0xc000112160?, 0x40?, 0x48573d?})
/home/jnml/pkg/mod/github.com/ebitengine/purego@v0.8.0/syscall.go:52 +0x15b
modernc.org/tk9%2e0.eval({0xc0001a4170?, 0xf})
/home/jnml/pkg/mod/modernc.org/tk9.0@v0.55.3/tk_purego.go:242 +0x112
modernc.org/tk9%2e0.evalErr({0xc0001a4170, 0xf})
/home/jnml/pkg/mod/modernc.org/tk9.0@v0.55.3/tk.go:403 +0x2f
modernc.org/tk9%2e0.(*Window).Wait(0xd6c370?)
/home/jnml/pkg/mod/modernc.org/tk9.0@v0.55.3/tk.go:1191 +0x212
main.(*app).gmain(0xc0000fa480, 0x5e99ad?)
/home/jnml/pkg/mod/modernc.org/equ@v1.1.0/gui.go:106 +0xfbf
main.(*app).main(0xc0000fa480?, 0x7fff4cdba348?)
/home/jnml/pkg/mod/modernc.org/equ@v1.1.0/main.go:171 +0x245
main.main()
/home/jnml/pkg/mod/modernc.org/equ@v1.1.0/main.go:111 +0x54a
^C
[1]+ Ukončena 2 equ -dark -g '\sum_{k=1}^n k^2={1 \over 2} n(n+1).'
jnml@3900x:~$