Close child windows and dialogs with main window

Most child windows should be closed with the main application
window otherwise if left open and if making specific
modifictions could potentially cause a SIGSEGV.

To solve that we mark all custom windows/dialogs with
the Qt::WA_QuitOnClose attribute on instance creation.

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

qt-ui/about.cpp

@@ -9,6 +9,7 @@
 SubsurfaceAbout *SubsurfaceAbout::instance()
 {
 	static SubsurfaceAbout *self = new SubsurfaceAbout();
+	self->setAttribute(Qt::WA_QuitOnClose, false);
 	return self;
 }
 

qt-ui/divecomputermanagementdialog.cpp

@@ -26,6 +26,7 @@ void DiveComputerManagementDialog::init()
 DiveComputerManagementDialog* DiveComputerManagementDialog::instance()
 {
 	static DiveComputerManagementDialog *self = new DiveComputerManagementDialog();
+	self->setAttribute(Qt::WA_QuitOnClose, false);
 	return self;
 }
 

qt-ui/downloadfromdivecomputer.cpp

@@ -37,6 +37,7 @@ namespace DownloadFromDcGlobal{
 DownloadFromDCWidget *DownloadFromDCWidget::instance()
 {
 	static DownloadFromDCWidget *dialog = new DownloadFromDCWidget();
+	dialog->setAttribute(Qt::WA_QuitOnClose, false);
 	return dialog;
 }
 

qt-ui/mainwindow.cpp

@@ -298,6 +298,7 @@ void MainWindow::on_actionYearlyStatistics_triggered()
 	view->setModel(model);
 	view->setWindowModality(Qt::NonModal);
 	view->setMinimumWidth(600);
+	view->setAttribute(Qt::WA_QuitOnClose, false);
 	view->show();
 }
 

qt-ui/preferences.cpp

@@ -6,6 +6,7 @@
 PreferencesDialog* PreferencesDialog::instance()
 {
 	static PreferencesDialog *dialog = new PreferencesDialog();
+	dialog->setAttribute(Qt::WA_QuitOnClose, false);
 	return dialog;
 }
 

qt-ui/subsurfacewebservices.cpp

@@ -19,6 +19,7 @@ static gboolean merge_locations_into_dives(void);
 SubsurfaceWebServices* SubsurfaceWebServices::instance()
 {
 	static SubsurfaceWebServices *self = new SubsurfaceWebServices();
+	self->setAttribute(Qt::WA_QuitOnClose, false);
 	return self;
 }