Certain characters cause duplicate cursor action to incorrectly place cursor.

[notwithering]

Reproduction steps

1. Open markdown file
2. Paste example:

panic: cycle detected:
        ┌→┌─/a.txt: {{include b.txt}}
        │ └→/b.txt: {{include c.txt}}
        └─└→/c.txt: {{include a.txt}}

3. Place cursor at 2:13.
4. Press Alt+Shift+Down (or your duplicate cursor down keybind).
5. Visualize misaligned cursors

Current vs. Expected behavior

Current behavior

Duplcating the cursor down on lines with certain characters causes the new cursors to be misaligned.

Screencast_20260126_221650.webm

Expected behavior

Each duplicated cursor to be at the same character position.

Zed version and system specs

Zed: v0.220.5+stable (Zed)
OS: Linux Wayland arch unknown
Memory: 30.6 GiB
Architecture: x86_64
GPU: AMD Radeon RX 7800 XT (RADV NAVI32) || radv || Mesa 25.3.4-arch1.1

Attach Zed log file

No response

Relevant Zed settings

No response

Relevant Keymap

keymap.json

// Zed keymap
//
// For information on binding keys, see the Zed
// documentation: https://zed.dev/docs/key-bindings
//
// To see the default key bindings run `zed: open default keymap`
// from the command palette.
[
  {
    "context": "Workspace",
    "bindings": {
      // "shift shift": "file_finder::Toggle"
    }
  },
  {
    "context": "Editor",
    "bindings": {
      // "j k": ["workspace::SendKeystrokes", "escape"]
    }
  }
]

(for AI issues) Model provider details

No response

If you are using WSL on Windows, what flavor of Linux are you using?

None

[notwithering]

@miguelraz, I'd say the area:editor tag matches more closely than area:preview/markdown as this deals specifically with the code editor itself and not the preview pane for markdown. Especially since I could throw the same snippet into a C file and have the same behavior. Correct me if I'm wrong though.