Autocomplete tweaks: remove search blocker, fix debounce params #869

This is to address #869 (closed)

I changed the debounce parameters makes sure it doesn't fetch on the initial character but when you stop typing.

I removed the "don't search if we already have some results" as it can make it impossible to get the results you want, and added a list of recent queries to remove duplicate searches.

src/components/emoji_input/suggestor.js

-import { debounce } from 'lodash'
+import debounce from 'lodash/debounce'
 /**
  * suggest - generates a suggestor function to be used by emoji-input
  * data: object providing source information for specific types of suggestions:
@@ -13,7 +13,7 @@ import { debounce } from 'lodash'
 
 const debounceUserSearch = debounce((data, input) => {
   data.updateUsersList(input)
-}, 500, { leading: true, trailing: false })
+}, 500)
 
 export default data => input => {
   const firstChar = input[0]
@@ -97,8 +97,8 @@ export const suggestUsers = data => input => {
     replacement: '@' + screen_name + ' '
   }))
 
-  // BE search users if there are no matches
-  if (newUsers.length === 0 && data.updateUsersList) {
+  // BE search users to get more comprehensive results
+  if (data.updateUsersList) {
     debounceUserSearch(data, noPrefix)
   }
   return newUsers