Guild Wars 2

So ranger skill called rapid fire shall be canceled when target disappears, u can stealth without stamina and still get full rapid fire on face from glass ranger when u are invisible – it can be an insta death.

Intended. Its the same case with all channelled attacks.
One of the counters against stealth.

also when some1 is hitting u by using rapid fire when u are in stealth other enemies can know your position.

Stealth is weak to AoE and channeled attacks. Working as intended as stated above.

Once again, this is intended. Thieves have access to a ton of evades, interrupts, blinds, etc. don’t rely on cheese stealth to get you out of every situation.