Curser/Caret deletes while typing

Question

I've pressed some combination of button by accident and in doing so caused the cursor/caret to stop working properly. When I type in the editor it replaces what I already have with the new text

For instance, if I have

    if(this.class()==foo){...}

And I try adding "del" infront of 'this.class()' it comes out as

    if(dels.class()==foo){...}

How do I turn this effect off? It's not block cursor or selection mode.

Answer 1

Found out I activated the Insert/overwrite keymap by pressing 'insert'