Only one instance of the settings dialog should be open at once

widgets/notebook.cpp

@@ -181,9 +181,7 @@ void Notebook::resizeEvent(QResizeEvent *)
 
 void Notebook::settingsButtonClicked()
 {
-    SettingsDialog *a = new SettingsDialog();
-
-    a->show();
+    SettingsDialog::showDialog();
 }
 
 void Notebook::usersButtonClicked()

widgets/notebookbutton.h

@@ -33,6 +33,7 @@ private:
     bool _mouseDown = false;
     QPoint _mousePos;
 };
+
 }  // namespace widgets
 }  // namespace chatterino
 

widgets/settingsdialog.cpp

@@ -1,6 +1,6 @@
 #include "widgets/settingsdialog.h"
-#include "twitch/twitchaccount.h"
 #include "accountmanager.h"
+#include "twitch/twitchaccount.h"
 #include "widgets/settingsdialogtab.h"
 #include "windowmanager.h"
 
@@ -299,6 +299,16 @@ void SettingsDialog::select(SettingsDialogTab *tab)
     _selectedTab = tab;
 }
 
+void SettingsDialog::showDialog()
+{
+    static SettingsDialog *instance = new SettingsDialog();
+
+    instance->show();
+    instance->activateWindow();
+    instance->raise();
+    instance->setFocus();
+}
+
 /// Widget creation helpers
 QCheckBox *SettingsDialog::createCheckbox(const QString &title, Setting<bool> &setting)
 {

widgets/settingsdialog.h

@@ -26,6 +26,8 @@ public:
 
     void select(SettingsDialogTab *tab);
 
+    static void showDialog();
+
 private:
     SettingsSnapshot _snapshot;