Is there a quick way to turn that triangle into a square by "splitting" the selected vertex? Something like an extrusion that will follow the edge.
The red arrow is where the new vertex should go, the green one is the position of the edge that is linked to the new vertex.
I know I can make something similar with the hotkey V to separate the vertex but i still have to fill the gaps:
I also know that I can simply use the knife tool to add an edge and then remove the edge between the two triangles to have a quad.
The final result I want to achieve:
It is simply that I wonder if there is a way to slide a vertex with some of its edges (not all) or if it is not possible.