Diacritical character being displayed when it shouldn't in the database password.

### Checks

- [x] I have read the Wiki, searched the open issues, and still think this is a new bug.

### Explain the problem clearly and succinctly:

If I click in the button to show the database password then click it again to hide it and I add with a physical keyboard a diacritical character in the password such as "¨" or a character that combines with diacritical character such as "ÿ", it remains visible even if I add other characters.

Edit: I forgot to say that I can see the last character I typef for a few seconds, which is intended, but I don't know if there is a setting to disable it and if there is, if it's possible to reproduce this bug when toggled. Or maybe that's something only for physical keyboards?


But if I add another diacritical character, it stops being visible.


### Describe what you expected to happen:

I expected not to be able to see a character like this in my password. The only character I expected to be visible is the last one.

### KeePassDX version:

4.3.2

### Build:

Free

### Database version:

Doesn't matter

### Android version:

10

Start by reproducing the issue on Android 10 in the database password field: toggle password visibility, hide it, then enter diacritical characters with a physical keyboard. Inspect the password-field visibility behavior; done means only the most recently typed character is briefly visible and earlier characters, including diacritical ones, remain hidden.

Written by the indexing model from the issue text.