How do I get my character to continue sliding to avoid top-side collisions?

I'm trying to make a platformer where the player can use different movement mechanics. One of them is a classic mega man style slide. I can get the player to slide just fine. When the player slides, I switch the width and height so the hitbox is on its side, move the player forward, then change the hitbox back. However, if the top-side of the hitbox (after I change it back to normal) is going to collide with a solid, I want it to keep sliding until there is no collision. Is there a way to do that?

Use an extra invisible helper hitbox while sliding to detect obstacles. End slide only if hitbox is clear.

This worked. Thank you!