UI: Add (Do not show again) checkbox to dock closing warning

Closes obsproject/obs-studio#1717

UI/data/locale/en-US.ini

@@ -85,6 +85,7 @@ StudioMode.Program="Program"
 ShowInMultiview="Show in Multiview"
 VerticalLayout="Vertical Layout"
 Group="Group"
+DoNotShowAgain="Do not show again"
 
 # warning if program already open
 AlreadyRunning.Title="OBS is already running"

UI/window-dock.cpp

@@ -2,14 +2,28 @@
 #include "obs-app.hpp"
 
 #include <QMessageBox>
+#include <QCheckBox>
 
 void OBSDock::closeEvent(QCloseEvent *event)
 {
 	auto msgBox = [] ()
 	{
-		QMessageBox::information(App()->GetMainWindow(),
-				QTStr("DockCloseWarning.Title"),
-				QTStr("DockCloseWarning.Text"));
+		QMessageBox msgbox(App()->GetMainWindow());
+		msgbox.setWindowTitle(QTStr("DockCloseWarning.Title"));
+		msgbox.setText(QTStr("DockCloseWarning.Text"));
+		msgbox.setIcon(QMessageBox::Icon::Information);
+		msgbox.addButton(QMessageBox::Ok);
+
+		QCheckBox *cb = new QCheckBox(QTStr("DoNotShowAgain"));
+		msgbox.setCheckBox(cb);
+
+		msgbox.exec();
+
+		if (cb->isChecked()) {
+			config_set_bool(App()->GlobalConfig(), "General",
+					"WarnedAboutClosingDocks", true);
+			config_save_safe(App()->GlobalConfig(), "tmp", nullptr);
+		}
 	};
 
 	bool warned = config_get_bool(App()->GlobalConfig(), "General",
@@ -18,9 +32,6 @@ void OBSDock::closeEvent(QCloseEvent *event)
 		QMetaObject::invokeMethod(App(), "Exec",
 				Qt::QueuedConnection,
 				Q_ARG(VoidFunc, msgBox));
-		config_set_bool(App()->GlobalConfig(), "General",
-				"WarnedAboutClosingDocks", true);
-		config_save_safe(App()->GlobalConfig(), "tmp", nullptr);
 	}
 
 	QDockWidget::closeEvent(event);