[svelte 5]: stopPropagation works differently than v4 (non runes mode)

[rob-balfre]

Describe the bug

stopPropagation no longer getting caught by container elements

Blocking people using svelte-select with v5
rob-balfre/svelte-select#680

Reproduction

v5 REPL:
https://svelte-5-preview.vercel.app/#H4sIAAAAAAAAE2WQwWrDMAyGX8Xo0hbKOnpM08BgD7D7vIMbK5mZIxlbDi1p3n04GRTWk_D_S78-a4LOeUxQfU5AZkCo4C0E2IPcQnmkEb0g7CFxjm1R6tRGF6TRpKXL1IpjUt-GrMcctib2OzUVT0vLlNjji-d-0U9FLNasqT48Yqi2blRMVWBHgjGH87TdqXPziN1wFoyb3bysfeq_h4gjkrxjZ7KXexIOH5GD6c2CF9njWQMxoYZmpasvWYSp5LTetT__h54ZHNHKsPSrAevDmrFCHawbm_KztWqqk9w8LmYB_rvKhaPFWKljuKrE3ll18RlPqxmMtY76Sh1fw_X0uNUSBHsY2LrOoYVKYsb5a_4F8lsCo8ABAAA=

v4 REPL:
https://svelte.dev/repl/d8eb12c5d909474aac79f5bdba783d0c?version=4.2.15

Logs

No response

System Info

System:
    OS: macOS 14.4.1
    CPU: (8) arm64 Apple M1
    Memory: 122.20 MB / 8.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 20.11.1 - ~/.nvm/versions/node/v20.11.1/bin/node
    Yarn: 1.22.10 - /usr/local/bin/yarn
    npm: 10.2.4 - ~/.nvm/versions/node/v20.11.1/bin/npm
    pnpm: 9.0.6 - ~/pnpm/pnpm
    bun: 1.0.0 - ~/.bun/bin/bun
  Browsers:
    Chrome: 124.0.6367.91
    Firefox Nightly: 124.0a1
    Safari: 17.4.1
    Safari Technology Preview: 17.4

Severity

blocking an upgrade

[nuts-n-bits]

There is a new syntax with svelte 5 which does these things: https://svelte-5-preview.vercel.app/docs/event-handlers#event-modifiers

It doesn't mean this issue is invalid, but it's good to know if you don't already.

[rob-balfre]

@dummdidumm many many thanks! 🙏