plugin-search: Pressing the Enter key to finalize the converted text will cause a unintended page transition

[piyoppi]

• I confirm that this is an issue rather than a question.

Bug report

When typing a text in the search box and pressing Enter to convert it, the active suggestion is selected, causing an unintended page transition.
(In Japanese input, we often use the Enter key to confirm a character conversion.)

This issue was occered in a MacOS browsers (Chrome, Firefox). It was not reproduced in Windows OS.

Steps to reproduce

I add markdown file written in Japanese. https://github.com/piyoppi/vuepress/tree/demo-plugin-search-with-ime/packages/docs/docs/demo-for-japanese-input

It is including in the following branch. You can reproduce it by entering Japanese text (e.g. "タイトル") in the search box.

https://github.com/piyoppi/vuepress/tree/demo-plugin-search-with-ime

What is expected?

Pressing the Enter key to finalize the converted text will not cause a page transition.

What is actually happening?

Pressing the Enter key to finalize the converted text will cause a page transition.

Other relevant information

• Output of npx vuepress info in my VuePress project:

[piyoppi]

I tried to fix the issue using Implicit submission of Form.

piyoppi@89f26c6

I am going to submit a pull request.