ignore hashtag suggestions if they vary only in case

app/javascript/mastodon/actions/compose.js

@@ -36,6 +36,7 @@ export const THUMBNAIL_UPLOAD_PROGRESS = 'THUMBNAIL_UPLOAD_PROGRESS';
 export const COMPOSE_SUGGESTIONS_CLEAR = 'COMPOSE_SUGGESTIONS_CLEAR';
 export const COMPOSE_SUGGESTIONS_READY = 'COMPOSE_SUGGESTIONS_READY';
 export const COMPOSE_SUGGESTION_SELECT = 'COMPOSE_SUGGESTION_SELECT';
+export const COMPOSE_SUGGESTION_IGNORE = 'COMPOSE_SUGGESTION_IGNORE';
 export const COMPOSE_SUGGESTION_TAGS_UPDATE = 'COMPOSE_SUGGESTION_TAGS_UPDATE';
 
 export const COMPOSE_TAG_HISTORY_UPDATE = 'COMPOSE_TAG_HISTORY_UPDATE';
@@ -502,13 +503,25 @@ export function selectComposeSuggestion(position, token, suggestion, path) {
       startPosition = position;
     }
 
-    dispatch({
-      type: COMPOSE_SUGGESTION_SELECT,
-      position: startPosition,
-      token,
-      completion,
-      path,
-    });
+    // We don't want to replace hashtags that vary only in case due to accessibility, but we need to fire off an event so that
+    // the suggestions are dismissed and the cursor moves forward.
+    if (suggestion.type !== 'hashtag' || token.slice(1).localeCompare(suggestion.name, undefined, { sensitivity: 'accent' }) !== 0) {
+      dispatch({
+        type: COMPOSE_SUGGESTION_SELECT,
+        position: startPosition,
+        token,
+        completion,
+        path,
+      });
+    } else {
+      dispatch({
+        type: COMPOSE_SUGGESTION_IGNORE,
+        position: startPosition,
+        token,
+        completion,
+        path,
+      });
+    }
   };
 };
 

app/javascript/mastodon/reducers/compose.js

@@ -21,6 +21,7 @@ import {
   COMPOSE_SUGGESTIONS_CLEAR,
   COMPOSE_SUGGESTIONS_READY,
   COMPOSE_SUGGESTION_SELECT,
+  COMPOSE_SUGGESTION_IGNORE,
   COMPOSE_SUGGESTION_TAGS_UPDATE,
   COMPOSE_TAG_HISTORY_UPDATE,
   COMPOSE_SENSITIVITY_CHANGE,
@@ -155,6 +156,17 @@ const insertSuggestion = (state, position, token, completion, path) => {
   });
 };
 
+const ignoreSuggestion = (state, position, token, completion, path) => {
+  return state.withMutations(map => {
+    map.updateIn(path, oldText => `${oldText.slice(0, position + token.length)} ${oldText.slice(position + token.length)}`);
+    map.set('suggestion_token', null);
+    map.set('suggestions', ImmutableList());
+    map.set('focusDate', new Date());
+    map.set('caretPosition', position + token.length + 1);
+    map.set('idempotencyKey', uuid());
+  });
+};
+
 const sortHashtagsByUse = (state, tags) => {
   const personalHistory = state.get('tagHistory');
 
@@ -375,6 +387,8 @@ export default function compose(state = initialState, action) {
     return state.set('suggestions', ImmutableList(normalizeSuggestions(state, action))).set('suggestion_token', action.token);
   case COMPOSE_SUGGESTION_SELECT:
     return insertSuggestion(state, action.position, action.token, action.completion, action.path);
+  case COMPOSE_SUGGESTION_IGNORE:
+    return ignoreSuggestion(state, action.position, action.token, action.completion, action.path);
   case COMPOSE_SUGGESTION_TAGS_UPDATE:
     return updateSuggestionTags(state, action.token);
   case COMPOSE_TAG_HISTORY_UPDATE: