Reproduction steps

1. Type AAA
2. Highlight A
3. Duplicate selection
4. Type

Notice selections were merged

Note: The merging of selections (as selections are being added) was fixed in #44811, this is about selections being merged on text insertion

Current vs. Expected behavior

Current (Zed):

Expected (VS Code):

Expected (Sublime Text):

Zed version and system specs

Zed: v0.219.0+nightly.2017.c1317baebebf955c589ef19d8c209b2ef526f75f (Zed Nightly c1317ba)
OS: macOS 26.1
Memory: 64 GiB
Architecture: aarch64

Attach Zed log file

Relevant Zed settings

Relevant Keymap

(for AI issues) Model provider details

No response

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

None