feat: add split action to clear /watching (#6759)

Reviewed-by: pajlada <rasmus.karlsson@pajlada.com>

src/controllers/commands/builtin/chatterino/Debugging.cpp

@@ -224,6 +224,19 @@ QString debugTest(const CommandContext &ctx)
                 break;
         }
     }
+    else if (command == "set-watching")
+    {
+        if (ctx.words.size() < 3)
+        {
+            ctx.channel->addSystemMessage("Missing name");
+            return {};
+        }
+        auto chan = getApp()->getTwitch()->getOrAddChannel(ctx.words.at(2));
+        if (chan != getApp()->getTwitch()->getWatchingChannel().get())
+        {
+            getApp()->getTwitch()->setWatchingChannel(chan);
+        }
+    }
     else
     {
         ctx.channel->addSystemMessage(

src/widgets/splits/SplitHeader.cpp

@@ -486,6 +486,22 @@ std::unique_ptr<QMenu> SplitHeader::createMainMenu()
                 })
             ->setVisible(twitchChannel->isLive());
 
+        if (this->split_->getIndirectChannel().getType() ==
+            Channel::Type::TwitchWatching)
+        {
+            menu->addAction("Reset /watching", this->split_, [] {
+                if (!getApp()
+                         ->getTwitch()
+                         ->getWatchingChannel()
+                         .get()
+                         ->isEmpty())
+                {
+                    getApp()->getTwitch()->setWatchingChannel(
+                        Channel::getEmpty());
+                }
+            });
+        }
+
         menu->addSeparator();
     }