CaptureWidget: define flags outside of the constructor

src/core/controller.cpp

@@ -72,7 +72,19 @@ void Controller::createVisualCapture(const uint id, const QString &forcedSavePat
                 modalWidget->deleteLater();
             }
         } while (modalWidget);
+
         m_captureWindow = new CaptureWidget(id, forcedSavePath);
+#ifdef Q_OS_WIN
+        setWindowFlags(Qt::WindowStaysOnTopHint
+                       | Qt::FramelessWindowHint
+                       | Qt::Popup);
+#else
+        m_captureWindow->setWindowFlags(Qt::BypassWindowManagerHint
+                       | Qt::WindowStaysOnTopHint
+                       | Qt::FramelessWindowHint
+                       | Qt::Tool);
+#endif
+        m_captureWindow->resize(m_captureWindow->pixmap().size());
         connect(m_captureWindow, &CaptureWidget::captureFailed,
                 this, &Controller::captureFailed);
         connect(m_captureWindow, &CaptureWidget::captureTaken,