Floor boundarys line lock at the wall surface

[bayowindapo]

Seems they were trying to tackle this in this tread.

Floors don't follow the wall (Finishing floors from room boundary)

Hi everyone, I have already made finising floors from room boundary, but it’s not following the wall. So it has space, if i change the wall thickness. [Capture] Do you have any idea to fix it? Even if i make floor from wall surface, it’s meaningless, right? Should i lock the floor boundary to wall after creating the floor? something like that… Thank you for your help.

I can’t seem to find a method in the API that allows this.
It would be interesting to figure out. @Alban_de_Chasteigner