Disable Win11 rounded window corners when the status bar is hidden

src/qt/qt_mainwindow.cpp

@@ -122,6 +122,19 @@ extern int qt_nvr_save(void);
 #include "x11_util.h"
 #endif
 
+#ifdef Q_OS_WINDOWS
+#include <dwmapi.h>
+#ifndef DWMWA_WINDOW_CORNER_PREFERENCE
+#define DWMWA_WINDOW_CORNER_PREFERENCE 33
+#endif
+#ifndef DWMWCP_DEFAULT
+#define DWMWCP_DEFAULT 0
+#endif
+#ifndef DWMWCP_DONOTROUND
+#define DWMWCP_DONOTROUND 1
+#endif
+#endif
+
 #ifdef Q_OS_MACOS
 #    include "cocoa_keyboard.hpp"
 // The namespace is required to avoid clashing typedefs; we only use this
@@ -181,6 +194,10 @@ MainWindow::MainWindow(QWidget *parent)
     status->setSoundGainAction(ui->actionSound_gain);
     ui->stackedWidget->setMouseTracking(true);
     statusBar()->setVisible(!hide_status_bar);
+#ifdef Q_OS_WINDOWS
+    auto cornerPreference = (hide_status_bar ? DWMWCP_DONOTROUND : DWMWCP_DEFAULT);
+    DwmSetWindowAttribute((HWND) this->winId(), DWMWA_WINDOW_CORNER_PREFERENCE, (LPCVOID) &cornerPreference, sizeof(cornerPreference));
+#endif
     statusBar()->setStyleSheet("QStatusBar::item {border: None; } QStatusBar QLabel { margin-right: 2px; margin-bottom: 1px; }");
     this->centralWidget()->setStyleSheet("background-color: black;");
     ui->toolBar->setVisible(!hide_tool_bar);
@@ -1833,6 +1850,10 @@ MainWindow::on_actionHide_status_bar_triggered()
     hide_status_bar ^= 1;
     ui->actionHide_status_bar->setChecked(hide_status_bar);
     statusBar()->setVisible(!hide_status_bar);
+#ifdef Q_OS_WINDOWS
+    auto cornerPreference = (hide_status_bar ? DWMWCP_DONOTROUND : DWMWCP_DEFAULT);
+    DwmSetWindowAttribute((HWND) main_window->winId(), DWMWA_WINDOW_CORNER_PREFERENCE, (LPCVOID) &cornerPreference, sizeof(cornerPreference));
+#endif
     if (vid_resize >= 2) {
         setFixedSize(fixed_size_x, fixed_size_y + menuBar()->height() + (hide_status_bar ? 0 : statusBar()->height()) + (hide_tool_bar ? 0 : ui->toolBar->height()));
     } else {