Port yuzu-emu/yuzu#2968: configure_input: Fix input handling for ZL and ZR from controllers with analog triggers (#4984)

Co-authored-by: Frederic L. <freddyfunk@users.noreply.github.com>

src/citra_qt/configuration/configure_input.cpp

@@ -195,8 +195,21 @@ ConfigureInput::ConfigureInput(QWidget* parent)
         connect(button_map[button_id], &QPushButton::clicked, [this, button_id]() {
             HandleClick(
                 button_map[button_id],
-                [this, button_id](const Common::ParamPackage& params) {
+                [this, button_id](Common::ParamPackage params) {
-                    buttons_param[button_id] = params;
+                    // Workaround for ZL & ZR for analog triggers like on XBOX controllors.
+                    // Analog triggers (from controllers like the XBOX controller) would not
+                    // work due to a different range of their signals (from 0 to 255 on
+                    // analog triggers instead of -32768 to 32768 on analog joysticks). The
+                    // SDL driver misinterprets analog triggers as analog joysticks.
+                    // TODO: reinterpret the signal range for analog triggers to map the
+                    // values correctly. This is required for the correct emulation of the
+                    // analog triggers of the GameCube controller.
+                    if (button_id == Settings::NativeButton::ZL ||
+                        button_id == Settings::NativeButton::ZR) {
+                        params.Set("direction", "+");
+                        params.Set("threshold", "0.5");
+                    }
+                    buttons_param[button_id] = std::move(params);
                     // If the user closes the dialog, the changes are reverted in
                     // `GMainWindow::OnConfigure()`
                     ApplyConfiguration();