[vim] Update LastHPos in visual only if not infinity

Author: mightyguava

keymap/vim.js

@@ -1361,7 +1361,9 @@
               selectionStart.ch -= 1;
               curEnd.ch += 1;
             }
-            vim.lastHPos = curEnd.ch;
+            if (vim.lastHPos != Infinity) {
+              vim.lastHPos = curEnd.ch;
+            }
             selectionEnd = curEnd;
             selectionStart = (motionResult instanceof Array) ? curStart : selectionStart;
             if (vim.visualLine) {