Update FFmpeg handling and focus management

Refactor FFmpeg frame processing and improve focus management in panels. Add memory sanitization for debug builds and update KDDockWidgets integration.

app/window/mainwindow/mainwindow.cpp

@@ -29,15 +29,17 @@
 #include <QOffscreenSurface>
 #endif
 
+#include "KDDockWidgets/src/qtwidgets/Window_p.h"
 #include "dialog/about/about.h"
 #include "mainmenu.h"
 #include "mainstatusbar.h"
+#include "KDDockWidgets/src/LayoutSaver.h"
 #include "timeline/timelineundoworkarea.h"
 
 namespace olive
 {
 
-#define super KDDockWidgets::MainWindow
+#define super KDDockWidgets::QtWidgets::MainWindow
 
 MainWindow::MainWindow(QWidget *parent)
 	: super(QStringLiteral("OliveMain"), KDDockWidgets::MainWindowOption_None,
@@ -95,7 +97,7 @@ MainWindow::MainWindow(QWidget *parent)
 	//       emit the "shown" signal before emitting the "hidden" signals, resulting
 	//       in Core thinking there are -1 pixel samplers open. To mitigate that,
 	//       we force "shown" to emit ourselves here.
-	emit pixel_sampler_panel_->shown();
+	emit pixel_sampler_panel_->shown(Qt::OtherFocusReason);
 
 	// Make node-related connections
 	connect(node_panel_, &NodePanel::NodeSelectionChangedWithContexts,
@@ -382,7 +384,7 @@ void MainWindow::ToggleMaximizedPanel()
 		premaximized_state_.clear();
 
 		currently_focused_panel->raise();
-		currently_focused_panel->setFocus();
+		currently_focused_panel->setFocus(Qt::ActiveWindowFocusReason);
 
 		PanelManager::instance()->SetSuppressChangedSignal(false);
 	}
@@ -430,7 +432,7 @@ void MainWindow::SetProject(Project *p)
 	project_panel_->set_project(p);
 
 	if (project_) {
-		project_panel_->setFocus();
+		project_panel_->setFocus(Qt::OtherFocusReason);
 	}
 }