Allow vertical scrolling in input configuration

On screens that are of limited height (like the Steam Deck), certain
buttons of the input configuration are cut off and cannot be accessed.
Now a vertical scrollbar will show up when the minimum height is not
available.

src/yuzu/configuration/configure_input.cpp

@@ -3,6 +3,7 @@
 
 #include <memory>
 #include <thread>
+#include <QScrollArea>
 
 #include "core/core.h"
 #include "core/hid/emulated_controller.h"
@@ -112,7 +113,13 @@ void ConfigureInput::Initialize(InputCommon::InputSubsystem* input_subsystem,
 
     for (std::size_t i = 0; i < player_tabs.size(); ++i) {
         player_tabs[i]->setLayout(new QHBoxLayout(player_tabs[i]));
-        player_tabs[i]->layout()->addWidget(player_controllers[i]);
+
+        auto scroll_area = new QScrollArea(player_tabs[i]);
+        player_tabs[i]->layout()->addWidget(scroll_area);
+        scroll_area->setWidget(player_controllers[i]);
+        scroll_area->setWidgetResizable(true);
+        scroll_area->setFrameShape(QFrame::Shape::NoFrame);
+
         connect(player_controllers[i], &ConfigureInputPlayer::Connected, [&, i](bool is_connected) {
             // Ensures that the controllers are always connected in sequential order
             if (is_connected) {

src/yuzu/configuration/configure_input_player.ui

@@ -10,6 +10,18 @@
     <height>487</height>
    </rect>
   </property>
+  <property name="sizePolicy">
+   <sizepolicy hsizetype="Ignored" vsizetype="Minimum">
+    <horstretch>0</horstretch>
+    <verstretch>0</verstretch>
+   </sizepolicy>
+  </property>
+  <property name="minimumSize">
+   <size>
+    <width>0</width>
+    <height>743</height>
+   </size>
+  </property>
   <property name="windowTitle">
    <string>Configure Input</string>
   </property>