Added an option to make the expand icon transparent (stealth mode)

[pascalbros]

Just a small option to make the expand icon completely invisible.
It is needed when you want to hide the "Hidden" app icon in the system tray, completely.
I also added an option in settings, false by default, so the default behaviour doesn't change.

Cheers, Pascal.

What's this PR do?

• Added an "expand" transparent icon, it can be enabled/disabled in Preferences

What are the relevant Git tickets?

#173

[viettrungphan]

Can you add screenshots to show how it worked?

[ralts00]

thanks, i need!

[ralts00]

Thanks, how do I compile it?

[pascalbros]

Can you add screenshots to show how it worked?

Sure.
There's a new option in settings, when the user enables it, the arrow will disappear completely and replaced with a transparent icon.

[PlayingWithPi]

Can this be merged please ? @dwarvesf

[timofeyushka]

@pascalbros Thank you so so much for that essential fork! It saved me a lot of time so I could enjoy having stealth Hidden Bar icon right away! 😊

[pascalbros]

@pascalbros Thank you so so much for that essential fork! It saved me a lot of time so I could enjoy having stealth Hidden Bar icon right away! 😊

Cool, nice to hear that! Cheers!

[pascalbros]

@viettrungphan by any chance, would you consider to merge this? Seems helpful and can be disabled (disabled by default).
Cheers, Pascal