sort custom emojis alphabetically (#853)

app/src/main/java/com/keylesspalace/tusky/ComposeActivity.java

@@ -126,6 +126,7 @@ import java.io.InputStream;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
+import java.util.Comparator;
 import java.util.Date;
 import java.util.Iterator;
 import java.util.List;
@@ -303,6 +304,7 @@ public final class ComposeActivity
                 @Override
                 public void onResponse(@NonNull Call<List<Emoji>> call, @NonNull Response<List<Emoji>> response) {
                     emojiList = response.body();
+                    Collections.sort(emojiList, (a, b) -> a.getShortcode().toLowerCase().compareTo(b.getShortcode().toLowerCase()));
                     setEmojiList(emojiList);
                     cacheInstanceMetadata(activeAccount);
                 }