[bugfix] Invalidate timeline entries for status when stats change (#1879)

internal/timeline/unprepare.go

@@ -0,0 +1,50 @@
+// GoToSocial
+// Copyright (C) GoToSocial Authors admin@gotosocial.org
+// SPDX-License-Identifier: AGPL-3.0-or-later
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package timeline
+
+import (
+	"context"
+)
+
+func (t *timeline) Unprepare(ctx context.Context, itemID string) error {
+	t.Lock()
+	defer t.Unlock()
+
+	if t.items == nil || t.items.data == nil {
+		// Nothing to do.
+		return nil
+	}
+
+	for e := t.items.data.Front(); e != nil; e = e.Next() {
+		entry := e.Value.(*indexedItemsEntry) // nolint:forcetypeassert
+
+		if entry.itemID != itemID && entry.boostOfID != itemID {
+			// Not relevant.
+			continue
+		}
+
+		if entry.prepared == nil {
+			// It's already unprepared (mood).
+			continue
+		}
+
+		entry.prepared = nil // <- eat this up please garbage collector nom nom nom
+	}
+
+	return nil
+}