clean up code, fix prediction bug

src/components/emoji_reactions/emoji_reactions.vue

@@ -0,0 +1,51 @@
+<template>
+  <div class="emoji-reactions">
+    <button
+      v-for="(users, emoji) in emojiReactions"
+      :key="emoji"
+      class="emoji-reaction btn btn-default"
+      :class="{ 'picked-reaction': reactedWith(emoji) }"
+      @click="emojiOnClick(emoji, $event)"
+    >
+      <span v-if="users">{{ users.length }}</span>
+      <span>{{ emoji }}</span>
+    </button>
+  </div>
+</template>
+
+<script src="./emoji_reactions.js" ></script>
+<style lang="scss">
+@import '../../_variables.scss';
+
+.emoji-reactions {
+  display: flex;
+  margin-top: 0.25em;
+  flex-wrap: wrap;
+}
+
+.emoji-reaction {
+  padding: 0 0.5em;
+  margin-right: 0.5em;
+  margin-top: 0.5em;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  box-sizing: border-box;
+  :first-child {
+    margin-right: 0.25em;
+  }
+  :last-child {
+    width: 1.5em;
+  }
+  &:focus {
+    outline: none;
+  }
+}
+
+.picked-reaction {
+  border: 1px solid var(--link, $fallback--link);
+  margin-left: -1px; // offset the border, can't use inset shadows either
+  margin-right: calc(0.5em - 1px);
+}
+
+</style>