Fix: Prevent marking messages as read when tab inactive

[really-not-lavacat]

Description

When chat in Cinny is opened in browser, but tab isn't active, Cinny marks messages in chat as read anyway, which is really confusing for the conversation partner (for conversation partner it looks like you ignore them).

This PR adds check of document.hidden. When tab is inactive, markAsRead will do nothing when calling it.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

[github-actions]

All contributors have signed the CLA ✍️ ✅
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[really-not-lavacat]

I have read the CLA Document and I hereby sign the CLA

[nekoedges]

Looks good, should not make anything bad

[greentore]

Doesn't really work for me. I think you should use document.hasFocus() instead.

[really-not-lavacat]

@greentore done! now markAsRead checks both document.hidden and document.hasFocus() (they're doing different things, so I included both checks)

[greentore]

I can't think of situation where document.hidden and document.hasFocus() both return true at the same time, so the first one is probably redundant.

[really-not-lavacat]

When I said and, I meant that I used or statement, so there's no need for both checks to return true at the same time. document.hidden and document.hasFocus()performing different checks, so I included both.

[ajbura]

It seems like a wrong place to add such conditioning as this function intent is to mark room as read. A good place for require changes would be the code where markAsRead is called (i guess in useEventArrive hook in RoomTimeline.tsx file)

[really-not-lavacat]

I guess you are right. Thanks for suggestions, I'll rewrite my code when I'll have enough time!