main: Convert to device independent coordinates for scaling

devicePixelRatioF() returns the scaling ratio when high dpi scaling is enabled.
When high dpi scaling is enabled, the raw screen coordinate system is scaled to device independent coordinates.

src/yuzu/applets/qt_software_keyboard.cpp

@@ -575,7 +575,7 @@ void QtSoftwareKeyboardDialog::MoveAndResizeWindow(QPoint pos, QSize size) {
     QDialog::resize(size);
 
     // High DPI
-    const float dpi_scale = qApp->screenAt(pos)->logicalDotsPerInch() / 96.0f;
+    const float dpi_scale = screen()->logicalDotsPerInch() / 96.0f;
 
     RescaleKeyboardElements(size.width(), size.height(), dpi_scale);
 }

src/yuzu/main.cpp

@@ -680,8 +680,10 @@ void GMainWindow::SoftwareKeyboardShowNormal() {
     const auto y = layout.screen.top;
     const auto w = layout.screen.GetWidth();
     const auto h = layout.screen.GetHeight();
+    const auto scale_ratio = devicePixelRatioF();
 
-    software_keyboard->ShowNormalKeyboard(render_window->mapToGlobal(QPoint(x, y)), QSize(w, h));
+    software_keyboard->ShowNormalKeyboard(render_window->mapToGlobal(QPoint(x, y) / scale_ratio),
+                                          QSize(w, h) / scale_ratio);
 }
 
 void GMainWindow::SoftwareKeyboardShowTextCheck(
@@ -714,9 +716,11 @@ void GMainWindow::SoftwareKeyboardShowInline(
                                                (1.0f - appear_parameters.key_top_scale_y))));
     const auto w = static_cast<int>(layout.screen.GetWidth() * appear_parameters.key_top_scale_x);
     const auto h = static_cast<int>(layout.screen.GetHeight() * appear_parameters.key_top_scale_y);
+    const auto scale_ratio = devicePixelRatioF();
 
     software_keyboard->ShowInlineKeyboard(std::move(appear_parameters),
-                                          render_window->mapToGlobal(QPoint(x, y)), QSize(w, h));
+                                          render_window->mapToGlobal(QPoint(x, y) / scale_ratio),
+                                          QSize(w, h) / scale_ratio);
 }
 
 void GMainWindow::SoftwareKeyboardHideInline() {
@@ -796,10 +800,11 @@ void GMainWindow::WebBrowserOpenWebPage(const std::string& main_url,
         }
 
         const auto& layout = render_window->GetFramebufferLayout();
-        web_browser_view.resize(layout.screen.GetWidth(), layout.screen.GetHeight());
-        web_browser_view.move(layout.screen.left, layout.screen.top + menuBar()->height());
-        web_browser_view.setZoomFactor(static_cast<qreal>(layout.screen.GetWidth()) /
-                                       static_cast<qreal>(Layout::ScreenUndocked::Width));
+        const auto scale_ratio = devicePixelRatioF();
+        web_browser_view.resize(layout.screen.GetWidth() / scale_ratio,
+                                layout.screen.GetHeight() / scale_ratio);
+        web_browser_view.move(layout.screen.left / scale_ratio,
+                              (layout.screen.top / scale_ratio) + menuBar()->height());
 
         web_browser_view.setFocus();
         web_browser_view.show();

src/yuzu/util/overlay_dialog.cpp

@@ -163,7 +163,7 @@ void OverlayDialog::MoveAndResizeWindow() {
     const auto height = static_cast<float>(parentWidget()->height());
 
     // High DPI
-    const float dpi_scale = parentWidget()->windowHandle()->screen()->logicalDotsPerInch() / 96.0f;
+    const float dpi_scale = screen()->logicalDotsPerInch() / 96.0f;
 
     const auto title_text_font_size = BASE_TITLE_FONT_SIZE * (height / BASE_HEIGHT) / dpi_scale;
     const auto body_text_font_size =