patch 8.1.0052: when mapping to <Nop> times out the next mapping is skipped

Problem:    When a mapping to <Nop> times out the next mapping is skipped.
Solution:   Reset "timedout" when waiting for a character. (Christian
            Brabandt, closes #2921)

src/getchar.c

@@ -2856,6 +2856,11 @@ vgetorpeek(int advance)
 /*
  * get a character: 3. from the user - get it
  */
+		if (typebuf.tb_len == 0)
+		    // timedout may have been set while waiting for a mapping
+		    // that has a <Nop> RHS.
+		    timedout = FALSE;
+
 		wait_tb_len = typebuf.tb_len;
 		c = inchar(typebuf.tb_buf + typebuf.tb_off + typebuf.tb_len,
 			typebuf.tb_buflen - typebuf.tb_off - typebuf.tb_len - 1,

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    52,
 /**/
     51,
 /**/