Address input navigation does not allow modifying suggested text

[freiondrej]

App version

1.118.0 (329)

macOS version

15.2 (24C101

Steps to reproduce the bug

(0. Ensure some page URL is remembered by the browser, e.g. https://github.com/duckduckgo/macos-browser/blob/main/CONTRIBUTING.md)

1. Open a new tab
2. Type some part of the url, e.g. github.com, until the URL appears as suggestion
3. If the suggestion is not the first one, use the down arrow key to focus it
4. Press the right arrow key to "accept" the suggestion (at this point the blue, suggested part of the url becomes white)
5. Press the backspace key

Expected behavior

The last letter of the url is removed, so the address bar now says https://github.com/duckduckgo/macos-browser/blob/main/CONTRIBUTING.m

Actual behavior

The last letter of the previously manually entered text is removed, so if the manually entered text was github.com, now the url is github.co.