Crash if double colon is input in path when changing directory

[ChimpSpin]

Reproduction steps

Open hx.
type :cd c::

The error

thread 'main' panicked at 'range start index 2 out of range for slice of length 0', library\std\src\path.rs:713:24
stack backtrace:
   0:     0x7ff6bee7e459 - <unknown>
   1:     0x7ff6be8958ba - <unknown>
   2:     0x7ff6bee78208 - <unknown>
   3:     0x7ff6bee81bb2 - <unknown>
   4:     0x7ff6bee81652 - <unknown>
   5:     0x7ff6bed443ab - <unknown>
   6:     0x7ff6bee822b7 - <unknown>
   7:     0x7ff6bee81de5 - <unknown>
   8:     0x7ff6bee7f687 - <unknown>
   9:     0x7ff6bee81d4f - <unknown>
  10:     0x7ff6bef01f90 - <unknown>
  11:     0x7ff6bef02127 - <unknown>
  12:     0x7ff6bee7a1fd - <unknown>
  13:     0x7ff6bee7a002 - <unknown>
  14:     0x7ff6bee7bd5a - <unknown>
  15:     0x7ff6beac3aad - <unknown>
  16:     0x7ff6bead8c6f - <unknown>
  17:     0x7ff6beb3e66c - <unknown>
  18:     0x7ff6bea62b24 - <unknown>
  19:     0x7ff6bea6ae39 - <unknown>
  20:     0x7ff6bea6ccb8 - <unknown>
  21:     0x7ff6beafba1b - <unknown>
  22:     0x7ff6bec33a1c - <unknown>
  23:     0x7ff6bed3e1b6 - <unknown>
  24:     0x7ff6bed4d468 - <unknown>
  25:     0x7ff6bed210b6 - <unknown>
  26:     0x7ff6bed37a6f - <unknown>
  27:     0x7ff6bed3c224 - <unknown>
  28:     0x7ff6bed23d5e - <unknown>
  29:     0x7ff6bed1b116 - <unknown>
  30:     0x7ff6bed38ffa - <unknown>
  31:     0x7ff6bee7debc - <unknown>
  32:     0x7ff6bed24127 - <unknown>
  33:     0x7ff6beefddac - <unknown>
  34:     0x7ff838da7034 - BaseThreadInitThunk
  35:     0x7ff839ae2651 - RtlUserThreadStart

Environment

• Platform: Windows
• Terminal emulator: PowerShell
• Helix version: v0.5.0-395-g0b55b21

[sudormrfbin]

I cannot reproduce this on Linux with v0.5.0-432-g7d510429, so this might be Windows specific.

[TrueBers]

Confirm the issue.

But it's not Windows specific, it's from the Rust upstream.

There was a panic in Path::strip_prefix if both the path and the prefix have the same value like at the line:

helix/helix-term/src/ui/mod.rs

Line 400 in 8c64c3d

path.strip_prefix(&dir).unwrap_or(path).to_path_buf()

Fixed in rust-lang/rust#93675, scheduled for 1.62 stable.