feat: get rid of memory leaks from SettingsDialog

SettingsDialog causes a lot of memory leaks. This patch changes the
logic to only create the dialog on demand. This was asans output stays
readable when no SettingsDialog is opened.

src/mainwindow.cpp

@@ -96,7 +96,6 @@ MainWindow::MainWindow(QWidget* parent)
     , m_startPage(new StartPage(this))
     , m_recordPage(new RecordPage(this))
     , m_resultsPage(new ResultsPage(m_parser, this))
-    , m_settingsDialog(new SettingsDialog(this))
 {
     ui->setupUi(this);
 
@@ -111,17 +110,6 @@ MainWindow::MainWindow(QWidget* parent)
 
     auto settings = Settings::instance();
 
-    connect(m_settingsDialog, &QDialog::accepted, this, [this, settings]() {
-        settings->setSysroot(m_settingsDialog->sysroot());
-        settings->setAppPath(m_settingsDialog->appPath());
-        settings->setExtraLibPaths(m_settingsDialog->extraLibPaths());
-        settings->setDebugPaths(m_settingsDialog->debugPaths());
-        settings->setKallsyms(m_settingsDialog->kallsyms());
-        settings->setArch(m_settingsDialog->arch());
-        settings->setObjdump(m_settingsDialog->objdump());
-        settings->setPerfMapPath(m_settingsDialog->perfMapPath());
-    });
-
     connect(settings, &Settings::sysrootChanged, m_resultsPage, &ResultsPage::setSysroot);
     connect(settings, &Settings::appPathChanged, m_resultsPage, &ResultsPage::setAppPath);
     connect(m_startPage, &StartPage::pathSettingsButtonClicked, this, &MainWindow::openSettingsDialog);
@@ -419,11 +407,26 @@ void MainWindow::aboutKDAB()
 
 void MainWindow::openSettingsDialog()
 {
-    m_settingsDialog->setWindowTitle(tr("Hotspot configuration"));
-    m_settingsDialog->setWindowIcon(windowIcon());
-    m_settingsDialog->adjustSize();
-    m_settingsDialog->initSettings();
-    m_settingsDialog->open();
+    auto settings = Settings::instance();
+
+    auto settingsDialog = new SettingsDialog(this);
+
+    connect(settingsDialog, &QDialog::accepted, this, [settingsDialog, settings]() {
+        settings->setSysroot(settingsDialog->sysroot());
+        settings->setAppPath(settingsDialog->appPath());
+        settings->setExtraLibPaths(settingsDialog->extraLibPaths());
+        settings->setDebugPaths(settingsDialog->debugPaths());
+        settings->setKallsyms(settingsDialog->kallsyms());
+        settings->setArch(settingsDialog->arch());
+        settings->setObjdump(settingsDialog->objdump());
+        settings->setPerfMapPath(settingsDialog->perfMapPath());
+    });
+
+    settingsDialog->setWindowTitle(tr("Hotspot configuration"));
+    settingsDialog->setWindowIcon(windowIcon());
+    settingsDialog->adjustSize();
+    settingsDialog->initSettings();
+    settingsDialog->open();
 }
 
 void MainWindow::aboutHotspot()

src/mainwindow.h

@@ -27,7 +27,6 @@ class KRecentFilesAction;
 class StartPage;
 class ResultsPage;
 class RecordPage;
-class SettingsDialog;
 
 class MainWindow : public KParts::MainWindow
 {
@@ -78,7 +77,6 @@ public slots:
     StartPage* m_startPage;
     RecordPage* m_recordPage;
     ResultsPage* m_resultsPage;
-    SettingsDialog* m_settingsDialog;
 
     KRecentFilesAction* m_recentFilesAction = nullptr;
     QAction* m_reloadAction = nullptr;

src/settingsdialog.cpp

@@ -78,6 +78,8 @@ SettingsDialog::SettingsDialog(QWidget* parent)
     addCallgraphPage();
 #endif
     addSourcePathPage();
+
+    setAttribute(Qt::WA_DeleteOnClose);
 }
 
 SettingsDialog::~SettingsDialog() = default;