Wrong highlighted position on Windows 10

Reported in 3567743-zen.

### Expected
The user expects the search result was highlighted at the correct position, i.e. on the search text.

### Observed
It was reported that the highlighted section of the search result is off position from the search text.

### Reproduced

1. Log in to the Simplenote app on Windows 10.
2. Type a search keyword, e.g. prescrizióne
3. See that the highlighted search result wasn't highlighting the text "prescrizióne" in the note.

Screenshots can be found on the ticket. I'm asking for the user's permission to attach them to this report. I wasn't able to replicate this on the web app and the Electron app on macOS. I'm also asking if the user is using an IME input.

### Where did you see the bug

- System Make: MSI
- System Model: GL63 8SE
- OS: Windows
- OS version: 10 Home 1909 18363.1256
- Simplenote app version: 2.2.0

Start by reproducing the search-result highlighting issue in the Simplenote Windows app on Windows 10 using a keyword such as “prescrizióne,” then compare the behavior with the web and macOS Electron app. Check whether IME input affects the mismatch and confirm that the result highlights the search text at the correct position.

Written by the indexing model from the issue text.