updated for version 7.4.306

Problem:    getchar(0) does not return Esc.
Solution:   Do not wait for an Esc sequence to be complete.  (Yasuhiro
            Matsumoto)

src/eval.c

@@ -11313,13 +11313,14 @@ f_getchar(argvars, rettv)
 	    n = safe_vgetc();
 	else if (get_tv_number_chk(&argvars[0], &error) == 1)
 	    /* getchar(1): only check if char avail */
-	    n = vpeekc();
-	else if (error || vpeekc() == NUL)
+	    n = vpeekc_any();
+	else if (error || vpeekc_any() == NUL)
 	    /* illegal argument or getchar(0) and no char avail: return zero */
 	    n = 0;
 	else
 	    /* getchar(0) and char avail: return char */
 	    n = safe_vgetc();
+
 	if (n == K_IGNORE)
 	    continue;
 	break;

src/getchar.c

@@ -1883,7 +1883,7 @@ vpeekc_nomap()
 }
 #endif
 
-#if defined(FEAT_INS_EXPAND) || defined(PROTO)
+#if defined(FEAT_INS_EXPAND) || defined(FEAT_EVAL) || defined(PROTO)
 /*
  * Check if any character is available, also half an escape sequence.
  * Trick: when no typeahead found, but there is something in the typeahead

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    306,
 /**/
     305,
 /**/