Fix all warnings from the cppcoreguidelines-pro-type-member-init clang-tidy check (#4426)

src/widgets/helper/ChannelView.hpp

@@ -256,8 +256,8 @@ private:
     void showReplyThreadPopup(const MessagePtr &message);
     bool canReplyToMessages() const;
 
-    QTimer *layoutCooldown_;
-    bool layoutQueued_;
+    QTimer *layoutCooldown_{};
+    bool layoutQueued_{};
 
     QTimer updateTimer_;
     bool updateQueued_ = false;
@@ -286,7 +286,7 @@ private:
     Split *split_ = nullptr;
 
     Scrollbar *scrollBar_;
-    EffectLabel *goToBottom_;
+    EffectLabel *goToBottom_{};
     bool showScrollBar_ = false;
 
     FilterSetPtr channelFilters_;

src/widgets/helper/NotebookTab.hpp

@@ -24,7 +24,7 @@ public:
 
     void updateSize();
 
-    QWidget *page;
+    QWidget *page{};
 
     void setCustomTitle(const QString &title);
     void resetCustomTitle();

src/widgets/helper/ScrollbarHighlight.hpp

@@ -35,9 +35,9 @@ public:
 private:
     std::shared_ptr<QColor> color_;
     Style style_;
-    bool isRedeemedHighlight_;
-    bool isFirstMessageHighlight_;
-    bool isElevatedMessageHighlight_;
+    bool isRedeemedHighlight_{};
+    bool isFirstMessageHighlight_{};
+    bool isElevatedMessageHighlight_{};
 };
 
 }  // namespace chatterino

src/widgets/helper/TitlebarButton.hpp

@@ -27,7 +27,7 @@ protected:
     void paintEvent(QPaintEvent *) override;
 
 private:
-    TitleBarButtonStyle style_;
+    TitleBarButtonStyle style_{};
 };
 
 }  // namespace chatterino