vim-patch:8.1.1967: line() only works for the current window

Problem:    Line() only works for the current window.
Solution:   Add an optional argument for the window to use.
8e0a8e7eb7

src/nvim/eval.lua

@@ -217,7 +217,7 @@ return {
     len={args=1},
     libcall={args=3},
     libcallnr={args=3},
-    line={args=1},
+    line={args={1, 2}},
     line2byte={args=1},
     lispindent={args=1},
     list2str={args={1, 2}},