Autocompleter: adjust the default search action behaviour

[01es]

Description

Issue #1944 introduced a change to the search action, causing it to complete all values irrespective of the input when tapped. Based on further usability observations and feedback, this functionality now needs to be refined.

• [ ] Alt+Click or Long-press should perform a search that matches the current input, instead of displaying all values.

This refinement is particularly relevant to mobile devices, where the only way to display matching values based on the input is to modify the input itself. However, it will also improve usability on desktops by removing the need to focus the input and press the down arrow key to trigger autocompletion of matching values.

Expected Outcome

Improved autocompletion behaviour, making it more intuitive and convenient, especially on mobiles devices.