Fix crash that could occur when closing down the last of a channel when reloading emotes (#4278)

* Fix crash that could occur when a channel is closed

Ensure we copy the QString in case the channel goes out of scope and
we're referring to nothing

* Add changelog entry

CHANGELOG.md

@@ -18,7 +18,8 @@
 - Bugfix: Fixed text sometimes not pasting properly when image uploader was disabled. (#4246)
 - Bugfix: Fixed text cursor(caret) not showing in open channel dialog. (#4196)
 - Bugfix: Fixed tooltip images not appearing if mouse hovered only first pixel. (#4268)
-- Bugfix: Fixed crash that could occurr when closing down a split at the wrong time. (#4277)
+- Bugfix: Fixed crash that could occur when closing down a split at the wrong time. (#4277)
+- Bugfix: Fixed crash that could occur when closing down the last of a channel when reloading emotes. (#4278)
 - Dev: Remove protocol from QApplication's Organization Domain (so changed from `https://www.chatterino.com` to `chatterino.com`). (#4256)
 - Dev: Ignore `WM_SHOWWINDOW` hide events, causing fewer attempted rescales. (#4198)
 - Dev: Migrated to C++ 20 (#4252, #4257)

src/providers/bttv/BttvEmotes.cpp

@@ -169,8 +169,7 @@ void BttvEmotes::loadChannel(std::weak_ptr<Channel> channel,
 {
     NetworkRequest(QString(bttvChannelEmoteApiUrl) + channelId)
         .timeout(20000)
-        .onSuccess([callback = std::move(callback), channel,
-                    &channelDisplayName,
+        .onSuccess([callback = std::move(callback), channel, channelDisplayName,
                     manualRefresh](auto result) -> Outcome {
             auto pair =
                 parseChannelEmotes(result.parseJson(), channelDisplayName);