fix: correctly scale SelectChannelDialog (#6081)

src/widgets/dialogs/SelectChannelDialog.hpp

@@ -3,13 +3,35 @@
 #include "widgets/BaseWindow.hpp"
 
 #include <pajlada/signals/signal.hpp>
+#include <QFocusEvent>
 #include <QLabel>
 #include <QLineEdit>
 #include <QRadioButton>
 
+#include <optional>
+
+namespace chatterino::detail {
+
+/// a radio button that checks itself when it receives focus
+class AutoCheckedRadioButton : public QRadioButton
+{
+public:
+    AutoCheckedRadioButton(const QString &label)
+        : QRadioButton(label)
+    {
+    }
+
+protected:
+    void focusInEvent(QFocusEvent * /*event*/) override
+    {
+        this->setChecked(true);
+    }
+};
+
+}  // namespace chatterino::detail
+
 namespace chatterino {
 
-class Notebook;
 class EditableModelView;
 class IndirectChannel;
 class Channel;
@@ -20,15 +42,16 @@ class SelectChannelDialog final : public BaseWindow
 public:
     SelectChannelDialog(QWidget *parent = nullptr);
 
-    void setSelectedChannel(IndirectChannel selectedChannel_);
+    void setSelectedChannel(std::optional<IndirectChannel> channel_);
     IndirectChannel getSelectedChannel() const;
     bool hasSeletedChannel() const;
 
     pajlada::Signals::NoArgSignal closed;
 
 protected:
-    void closeEvent(QCloseEvent *) override;
+    void closeEvent(QCloseEvent *event) override;
     void themeChangedEvent() override;
+    void scaleChangedEvent(float newScale) override;
 
 private:
     class EventFilter : public QObject
@@ -41,17 +64,25 @@ private:
     };
 
     struct {
-        Notebook *notebook;
-        struct {
-            QRadioButton *channel;
-            QLineEdit *channelName;
-            QRadioButton *whispers;
-            QRadioButton *mentions;
-            QRadioButton *watching;
-            QRadioButton *live;
-            QRadioButton *automod;
-        } twitch;
-    } ui_;
+        detail::AutoCheckedRadioButton *channel;
+        QLabel *channelLabel;
+        QLineEdit *channelName;
+
+        detail::AutoCheckedRadioButton *whispers;
+        QLabel *whispersLabel;
+
+        detail::AutoCheckedRadioButton *mentions;
+        QLabel *mentionsLabel;
+
+        detail::AutoCheckedRadioButton *watching;
+        QLabel *watchingLabel;
+
+        detail::AutoCheckedRadioButton *live;
+        QLabel *liveLabel;
+
+        detail::AutoCheckedRadioButton *automod;
+        QLabel *automodLabel;
+    } ui_{};
 
     EventFilter tabFilter_;