Fix immediate popup on start

autoload/which_key.vim

@@ -109,24 +109,19 @@ function! which_key#start(vis, bang, prefix) " {{{
     " parsed by vim-which-key itself with user defined prefix dictionary if avaliable.
     let s:runtime = s:create_runtime(mode, key)
 
-    if getchar(1)
-      while 1
-        try
-          let c = getchar()
-        catch /^Vim:Interrupt$/
-          return ''
-        endtry
-        if s:handle_char_on_start_is_ok(c)
-          return
-        endif
-        " When there are next level options, wait another timeoutlen.
-        " https://github.com/liuchengxu/vim-which-key/issues/3
-        " https://github.com/liuchengxu/vim-which-key/issues/4
-        if which_key#char_handler#wait_with_timeout()
-          break
-        endif
-      endwhile
-    endif
+    " When there are next level options, wait another timeoutlen.
+    " https://github.com/liuchengxu/vim-which-key/issues/3
+    " https://github.com/liuchengxu/vim-which-key/issues/4
+    while !which_key#char_handler#timeout_for_next_char()
+      try
+        let c = getchar()
+      catch /^Vim:Interrupt$/
+        return ''
+      endtry
+      if s:handle_char_on_start_is_ok(c)
+        return
+      endif
+    endwhile
   endif
 
   let s:last_runtime_stack = [copy(s:runtime)]