Fix diff toggles
Fix diff toggles

Hey, kids! Did you know that the value of `this` in arrow functions is the same as the value of `this` outside them?

j-f1/forked-metasmoke,j-f1/forked-metasmoke,angussidney/metasmoke,angussidney/metasmoke,Charcoal-SE/metasmoke,angussidney/metasmoke,Charcoal-SE/metasmoke,j-f1/forked-metasmoke,Charcoal-SE/metasmoke,j-f1/forked-metasmoke,Charcoal-SE/metasmoke,angussidney/metasmoke