Allow custom emoji reactions: add option to scale reaction buttons

src/components/emoji_reactions/emoji_reactions.vue

@@ -12,20 +12,20 @@
         @mouseenter="fetchEmojiReactionsByIfMissing()"
       >
         <span
-          v-if="reaction.url"
           class="reaction-emoji"
         >
           <img
+            v-if="reaction.url"
             :src="reaction.url"
             :title="reaction.name"
             class="reaction-emoji-content"
             width="1em"
           >
+          <span
+            v-else
+            class="reaction-emoji reaction-emoji-content"
+          >{{ reaction.name }}</span>
         </span>
-        <span
-          v-else
-          class="reaction-emoji reaction-emoji-content"
-        >{{ reaction.name }}</span>
         <span>{{ reaction.count }}</span>
       </button>
     </UserListPopover>
@@ -49,6 +49,8 @@
   margin-top: 0.25em;
   flex-wrap: wrap;
 
+  --emoji-size: calc(1.25em * var(--emojiReactionsScale, 1));
+
   .emoji-reaction {
     padding: 0 0.5em;
     margin-right: 0.5em;
@@ -59,17 +61,24 @@
     box-sizing: border-box;
 
     .reaction-emoji {
-      width: 1.25em;
-      height: 1.25em;
+      width: var(--emoji-size);
+      height: var(--emoji-size);
       margin-right: 0.25em;
+      line-height: var(--emoji-size);
+      display: flex;
+      justify-content: center;
+      align-items: center;
     }
 
     .reaction-emoji-content {
-      max-width: 1.25em;
-      max-height: 1.25em;
+      max-width: 100%;
+      max-height: 100%;
       width: auto;
       height: auto;
+      line-height: inherit;
       overflow: hidden;
+      font-size: calc(var(--emoji-size) * 0.8);
+      margin: 0;
     }
 
     &:focus {

src/components/settings_modal/tabs/general_tab.vue

@@ -271,6 +271,15 @@
             {{ $t('settings.no_rich_text_description') }}
           </BooleanSetting>
         </li>
+        <li>
+          <IntegerSetting
+            v-if="user"
+            path="emojiReactionsScale"
+            expert="1"
+          >
+            {{ $t('settings.emoji_reactions_scale') }}
+          </IntegerSetting>
+        </li>
         <h3>{{ $t('settings.attachments') }}</h3>
         <li>
           <BooleanSetting