Judging the `iScomposing` property when searchbox input

## Describe the problem

When you haven't selected it in the input method, you should not request a request.

## Describe the solution

Use https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/isComposing

No file or test is named. Start by locating the searchbox input handler and review how it decides when to request a search; use the linked KeyboardEvent.isComposing documentation. Done means input-method composition does not trigger a request until composition has ended.

Written by the indexing model from the issue text.