clicking link while onNavigate is pending toggles the URL

[stephanedemotte]

Describe the bug

Hello,

I've a weird issue, when i return promise on onNavigation, until the promise was resolve, if i "re-click" on the same link, the url "toggle"

Here a video

https://github.com/user-attachments/assets/efbf3657-e62e-4d50-b59f-f5ca78415dc2

Reproduction

https://github.com/stephanedemotte/svelte-routing-bug

Logs

No response

System Info

System:
    OS: macOS 14.6.1
    CPU: (12) x64 Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
    Memory: 562.87 MB / 16.00 GB
    Shell: 3.1.2 - /usr/local/bin/fish
  Binaries:
    Node: 22.6.0 - /usr/local/bin/node
    Yarn: 1.22.22 - /usr/local/bin/yarn
    npm: 10.8.2 - /usr/local/bin/npm
    pnpm: 9.7.0 - ~/Library/pnpm/pnpm
  Browsers:
    Chrome: 129.0.6668.100
    Safari: 18.0.1
  npmPackages:
    @sveltejs/adapter-auto: ^3.0.0 => 3.2.5
    @sveltejs/kit: ^2.0.0 => 2.7.0
    @sveltejs/vite-plugin-svelte: ^4.0.0-next.6 => 4.0.0-next.8
    svelte: ^5.0.0-next.1 => 5.0.0-next.264
    vite: ^5.0.3 => 5.4.9

Severity

blocking an upgrade

Additional Information

No response

[teemingc]

I've tested this and it happens on Svelte 4 too

[stephanedemotte]

@eltigerchino any news on this ? relative "big" issue no ?

[teemingc]

I'm so sorry. This definitely slipped through and I forgot about it. I'm currently investigating it and a solution seems close.

Something is setting the URL to the previous URL when we click on the link to a page while also navigating to it. In this case, it's suppose to simply call replaceState with the same URL but internally the URL is being resolved incorrectly in the client router's get_navigation_result_from_branch method.