[desktop] Rework game list to use MVP architecture (#4042)

Closes #3480

moves the game list model/worker/private stuff to qt_common for later
use in QML

- `qt_common/game_list/model.{cpp,h}` is the model
- `yuzu/game/game_{grid,tree}.*` are the views
- `yuzu/game/game_list.cpp` is the presenter

This was done very lazily in a manner that "works" while largely
maintaining existing structure as much as possible. Most of it is
copy-paste, with some bonus reworks/cleanups thrown in.

Signed-off-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4042
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: Lizzie <lizzie@eden-emu.dev>

src/yuzu/game/search_field.cpp

@@ -0,0 +1,124 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "game/game_list.h"
+#include "game/search_field.h"
+
+#include <QKeyEvent>
+#include <QToolButton>
+
+// TODO: Remove GameList dependence?
+GameListSearchField::KeyReleaseEater::KeyReleaseEater(GameList* gamelist_, QObject* parent)
+    : QObject(parent), gamelist{gamelist_} {}
+
+// EventFilter in order to process systemkeys while editing the searchfield
+bool GameListSearchField::KeyReleaseEater::eventFilter(QObject* obj, QEvent* event) {
+    // If it isn't a KeyRelease event then continue with standard event processing
+    if (event->type() != QEvent::KeyRelease)
+        return QObject::eventFilter(obj, event);
+
+    QKeyEvent* keyEvent = static_cast<QKeyEvent*>(event);
+    QString edit_filter_text = gamelist->search_field->edit_filter->text().toLower();
+
+    // If the searchfield's text hasn't changed special function keys get checked
+    // If no function key changes the searchfield's text the filter doesn't need to get reloaded
+    if (edit_filter_text == edit_filter_text_old) {
+        switch (keyEvent->key()) {
+        // Escape: Resets the searchfield
+        case Qt::Key_Escape: {
+            if (edit_filter_text_old.isEmpty()) {
+                return QObject::eventFilter(obj, event);
+            } else {
+                gamelist->search_field->edit_filter->clear();
+                edit_filter_text.clear();
+            }
+            break;
+        }
+        // Return and Enter
+        // If the enter key gets pressed first checks how many and which entry is visible
+        // If there is only one result launch this game
+        case Qt::Key_Return:
+        case Qt::Key_Enter: {
+            if (gamelist->search_field->visible == 1) {
+                const QString file_path = gamelist->GetLastFilterResultItem();
+
+                // To avoid loading error dialog loops while confirming them using enter
+                // Also users usually want to run a different game after closing one
+                gamelist->search_field->edit_filter->clear();
+                edit_filter_text.clear();
+                emit gamelist->GameChosen(file_path);
+            } else {
+                return QObject::eventFilter(obj, event);
+            }
+            break;
+        }
+        default:
+            return QObject::eventFilter(obj, event);
+        }
+    }
+    edit_filter_text_old = edit_filter_text;
+    return QObject::eventFilter(obj, event);
+}
+
+void GameListSearchField::setFilterResult(int visible_, int total_) {
+    visible = visible_;
+    total = total_;
+
+    label_filter_result->setText(tr("%1 of %n result(s)", "", total).arg(visible));
+}
+
+QString GameListSearchField::filterText() const {
+    return edit_filter->text();
+}
+
+void GameListSearchField::clear() {
+    edit_filter->clear();
+}
+
+void GameListSearchField::setFocus() {
+    if (edit_filter->isVisible()) {
+        edit_filter->setFocus();
+    }
+}
+
+GameListSearchField::GameListSearchField(GameList* parent) : QWidget{parent} {
+    auto* const key_release_eater = new KeyReleaseEater(parent, this);
+    layout_filter = new QHBoxLayout;
+    layout_filter->setContentsMargins(8, 8, 8, 8);
+    label_filter = new QLabel;
+    edit_filter = new QLineEdit;
+    edit_filter->clear();
+    edit_filter->installEventFilter(key_release_eater);
+    edit_filter->setClearButtonEnabled(true);
+    connect(edit_filter, &QLineEdit::textChanged, parent, &GameList::OnTextChanged);
+    label_filter_result = new QLabel;
+    button_filter_close = new QToolButton(this);
+    button_filter_close->setText(QStringLiteral("X"));
+    button_filter_close->setCursor(Qt::ArrowCursor);
+    button_filter_close->setStyleSheet(
+        QStringLiteral("QToolButton{ border: none; padding: 0px; color: "
+                       "#000000; font-weight: bold; background: #F0F0F0; }"
+                       "QToolButton:hover{ border: none; padding: 0px; color: "
+                       "#EEEEEE; font-weight: bold; background: #E81123}"));
+    connect(button_filter_close, &QToolButton::clicked, parent, &GameList::OnFilterCloseClicked);
+    layout_filter->setSpacing(10);
+    layout_filter->addWidget(label_filter);
+    layout_filter->addWidget(edit_filter);
+    layout_filter->addWidget(label_filter_result);
+    layout_filter->addWidget(button_filter_close);
+    setLayout(layout_filter);
+    RetranslateUI();
+}
+
+void GameListSearchField::changeEvent(QEvent* event) {
+    if (event->type() == QEvent::LanguageChange) {
+        RetranslateUI();
+    }
+
+    QWidget::changeEvent(event);
+}
+
+void GameListSearchField::RetranslateUI() {
+    label_filter->setText(tr("Filter:"));
+    edit_filter->setPlaceholderText(tr("Enter pattern to filter"));
+}