Add /fakemsg command (Chatterino#3448)

Co-authored-by: pajlada <rasmus.karlsson@pajlada.com>

CHANGELOG.md

@@ -83,6 +83,7 @@
 - Dev: Renamed CMake's build option `USE_SYSTEM_QT5KEYCHAIN` to `USE_SYSTEM_QTKEYCHAIN`. (#3103)
 - Dev: Add benchmarks that can be compiled with the `BUILD_BENCHMARKS` CMake flag. Off by default. (#3038)
 - Dev: Added CMake build option `BUILD_WITH_QTKEYCHAIN` to build with or without Qt5Keychain support (On by default). (#3318)
+- Dev: Added /fakemsg command for debugging (#3448)
 - Dev: Notebook::select\* functions now take an optional `focusPage` parameter (true by default) which keeps the default behaviour of selecting the page after it has been selected. If set to false, the page is _not_ focused after being selected. (#3446)
 
 ## 2.3.4

src/controllers/commands/CommandController.cpp

@@ -871,6 +871,22 @@ void CommandController::initialize(Settings &, Paths &paths)
         getApp()->twitch2->sendRawMessage(words.mid(1).join(" "));
         return "";
     });
+#ifndef NDEBUG
+    this->registerCommand(
+        "/fakemsg",
+        [](const QStringList &words, ChannelPtr channel) -> QString {
+            if (words.size() < 2)
+            {
+                channel->addMessage(makeSystemMessage(
+                    "Usage: /fakemsg (raw irc text) - injects raw irc text as "
+                    "if it was a message received from TMI"));
+                return "";
+            }
+            auto ircText = words.mid(1).join(" ");
+            getApp()->twitch2->addFakeMessage(ircText);
+            return "";
+        });
+#endif
 }
 
 void CommandController::save()