Can someone please explain me why the following code doesn't result in a fill?
And why, sometimes, I get such "very thin lines" artifact (that's visibile in my picture)?
\begin{tikzpicture}
\node (A) at (0,0) {A};
\node (B) at (1,0) {B};
\node (C) at (1,1) {C};
\fill[red] (A) -- (B) -- (C) --cycle;
\end{tikzpicture}
Here's what I get: