fix: ignore tab switch when user focused on window just now

[starccy]

related to: #262

When pressing Alt + Tab to switch back to the app, the Tab pressed event will be captured immediately, which causes this issue.

I resolve to use the iced window focus event to determine if users switched between the windows and record the timestamp of the focus event meanwhile.
When the SwitchPage message is emitted, first check if users just switched windows within a short period. If so, just ignore this request.

[GyulyVGC]

Amazing, I will review and try it in the following days.
Tyvm 🙏

[GyulyVGC]

I only simplified something I thought unnecessary, but the overall process is the same and it's good imo.

Before merging I'd like that @Aloso could confirm the problem is solved for him as well.
I still wasn't able to reproduce this problem on my macOS, so having the confirmation from who originally opened the issue would be the best thing.

[Aloso]

Thanks! I'll check later today 🙂

[Aloso]

@starccy @GyulyVGC I tried this branch and can confirm that it fixes the bug for me (on Arch Linux with KDE Plasma) 🚀

[GyulyVGC]

Awesome! Thanks for the confirmation 😄

[GyulyVGC]

@all-contributors please add @starccy for code.

[allcontributors]

@GyulyVGC

I've put up a pull request to add @starccy! 🎉