BranchWatchDialog: Fix Misc. Errata

Window icon was missing from QDialog lacking a parent.
Giving the QDialog a parent revealed I had failed to make it properly non-modal, necessitating further changes.
Settings save less often, now only upon destruction.
Construction of BranchWatchDialog is now deferred.

Source/Core/DolphinQt/Debugger/BranchWatchDialog.cpp

@@ -504,15 +504,9 @@ BranchWatchDialog::BranchWatchDialog(Core::System& system, Core::BranchWatch& br
   restoreGeometry(settings.value(QStringLiteral("branchwatchdialog/geometry")).toByteArray());
 }
 
-void BranchWatchDialog::done(int r)
+BranchWatchDialog::~BranchWatchDialog()
 {
-  if (m_timer->isActive())
-    m_timer->stop();
-  auto& settings = Settings::GetQSettings();
-  settings.setValue(QStringLiteral("branchwatchdialog/geometry"), saveGeometry());
-  settings.setValue(QStringLiteral("branchwatchdialog/tableheader/state"),
-                    m_table_view->horizontalHeader()->saveState());
-  QDialog::done(r);
+  SaveSettings();
 }
 
 static constexpr int BRANCH_WATCH_TOOL_TIMER_DELAY_MS = 100;
@@ -523,18 +517,18 @@ static bool TimerCondition(const Core::BranchWatch& branch_watch, Core::State st
   return branch_watch.GetRecordingActive() && state > Core::State::Paused;
 }
 
-int BranchWatchDialog::exec()
+void BranchWatchDialog::hideEvent(QHideEvent* event)
 {
-  if (TimerCondition(m_branch_watch, Core::GetState()))
-    m_timer->start(BRANCH_WATCH_TOOL_TIMER_DELAY_MS);
-  return QDialog::exec();
+  if (m_timer->isActive())
+    m_timer->stop();
+  QDialog::hideEvent(event);
 }
 
-void BranchWatchDialog::open()
+void BranchWatchDialog::showEvent(QShowEvent* event)
 {
   if (TimerCondition(m_branch_watch, Core::GetState()))
     m_timer->start(BRANCH_WATCH_TOOL_TIMER_DELAY_MS);
-  QDialog::open();
+  QDialog::showEvent(event);
 }
 
 void BranchWatchDialog::OnStartPause(bool checked)
@@ -927,6 +921,14 @@ void BranchWatchDialog::OnTableCopyAddress(QModelIndexList index_list)
   QApplication::clipboard()->setText(text);
 }
 
+void BranchWatchDialog::SaveSettings()
+{
+  auto& settings = Settings::GetQSettings();
+  settings.setValue(QStringLiteral("branchwatchdialog/geometry"), saveGeometry());
+  settings.setValue(QStringLiteral("branchwatchdialog/tableheader/state"),
+                    m_table_view->horizontalHeader()->saveState());
+}
+
 void BranchWatchDialog::Update()
 {
   if (m_branch_watch.GetRecordingPhase() == Core::BranchWatch::Phase::Blacklist)

Source/Core/DolphinQt/Debugger/BranchWatchDialog.h

@@ -49,9 +49,11 @@ class BranchWatchDialog : public QDialog
 public:
   explicit BranchWatchDialog(Core::System& system, Core::BranchWatch& branch_watch,
                              CodeWidget* code_widget, QWidget* parent = nullptr);
-  void done(int r) override;
-  int exec() override;
-  void open() override;
+  ~BranchWatchDialog() override;
+
+protected:
+  void hideEvent(QHideEvent* event) override;
+  void showEvent(QShowEvent* event) override;
 
 private:
   void OnStartPause(bool checked);
@@ -82,6 +84,8 @@ private:
   void OnTableSetNOP(QModelIndexList index_list);
   void OnTableCopyAddress(QModelIndexList index_list);
 
+  void SaveSettings();
+
 public:
   // TODO: Step doesn't cause EmulationStateChanged to be emitted, so it has to call this manually.
   void Update();

Source/Core/DolphinQt/Debugger/CodeWidget.cpp

@@ -36,10 +36,7 @@ static const QString BOX_SPLITTER_STYLESHEET = QStringLiteral(
     "QSplitter::handle { border-top: 1px dashed black; width: 1px; margin-left: 10px; "
     "margin-right: 10px; }");
 
-CodeWidget::CodeWidget(QWidget* parent)
-    : QDockWidget(parent), m_system(Core::System::GetInstance()),
-      m_branch_watch_dialog(
-          new BranchWatchDialog(m_system, m_system.GetPowerPC().GetBranchWatch(), this))
+CodeWidget::CodeWidget(QWidget* parent) : QDockWidget(parent), m_system(Core::System::GetInstance())
 {
   setWindowTitle(tr("Code"));
   setObjectName(QStringLiteral("code"));
@@ -215,7 +212,12 @@ void CodeWidget::ConnectWidgets()
 
 void CodeWidget::OnBranchWatchDialog()
 {
-  m_branch_watch_dialog->open();
+  if (m_branch_watch_dialog == nullptr)
+  {
+    m_branch_watch_dialog =
+        new BranchWatchDialog(m_system, m_system.GetPowerPC().GetBranchWatch(), this, this);
+  }
+  m_branch_watch_dialog->show();
   m_branch_watch_dialog->raise();
   m_branch_watch_dialog->activateWindow();
 }
@@ -397,7 +399,8 @@ void CodeWidget::UpdateSymbols()
 
   // TODO: There seems to be a lack of a ubiquitous signal for when symbols change.
   // This is the best location to catch the signals from MenuBar and CodeViewWidget.
-  m_branch_watch_dialog->UpdateSymbols();
+  if (m_branch_watch_dialog != nullptr)
+    m_branch_watch_dialog->UpdateSymbols();
 }
 
 void CodeWidget::UpdateFunctionCalls(const Common::Symbol* symbol)
@@ -470,7 +473,8 @@ void CodeWidget::Step()
   // Will get a UpdateDisasmDialog(), don't update the GUI here.
 
   // TODO: Step doesn't cause EmulationStateChanged to be emitted, so it has to call this manually.
-  m_branch_watch_dialog->Update();
+  if (m_branch_watch_dialog != nullptr)
+    m_branch_watch_dialog->Update();
 }
 
 void CodeWidget::StepOver()

Source/Core/DolphinQt/Debugger/CodeWidget.h

@@ -72,7 +72,7 @@ private:
 
   Core::System& m_system;
 
-  BranchWatchDialog* m_branch_watch_dialog;
+  BranchWatchDialog* m_branch_watch_dialog = nullptr;
   QLineEdit* m_search_address;
   QPushButton* m_branch_watch;