Port several small multiplayer PRs from yuzu (#7419)

* yuzu: Use displayed port on direct connect

* Color player counts in the multiplayer public lobby list

- Full lobbies have their player count displayed in red.
- Lobbies with one slot left have their player count displayed in orange.
- Empty lobbies have their player count grayed out.

* Add hotkeys for multiplayer actions

Default shortcuts were chosen as to be intuitive (use the first letter
of the action, or the second word's first letter) and work on all
types of keyboards. The hotkeys can be used while playing a game too,
as they are application-wide.

* Persist filters in multiplayer public lobby list

After connecting to a room, the chosen filter text, "Games I Own",
"Hide Empty Rooms" and "Hide Full Rooms" values are persisted
to configuration so they are preserved across restarts.

This makes it easier to rejoin a room if you regularly play the same
game, or after a crash.

* citra_qt/lobby: Fix multiplayer player count color in dark theme

Co-Authored-By: Kevnkkm <56404895+kevnkkm@users.noreply.github.com>

* Address review comments

---------

Co-authored-by: Narr the Reg <juangerman-13@hotmail.com>
Co-authored-by: Hugo Locurcio <hugo.locurcio@hugo.pro>
Co-authored-by: Kevnkkm <56404895+kevnkkm@users.noreply.github.com>

src/citra_qt/multiplayer/direct_connect.cpp

@@ -80,9 +80,8 @@ void DirectConnectWindow::Connect() {
     // Store settings
     UISettings::values.nickname = ui->nickname->text();
     UISettings::values.ip = ui->ip->text();
-    UISettings::values.port = (ui->port->isModified() && !ui->port->text().isEmpty())
-                                  ? ui->port->text()
-                                  : UISettings::values.port;
+    UISettings::values.port =
+        !ui->port->text().isEmpty() ? ui->port->text() : UISettings::values.port;
 
     // attempt to connect in a different thread
     QFuture<void> f = QtConcurrent::run([&] {

src/citra_qt/multiplayer/lobby.cpp

@@ -63,10 +63,10 @@ Lobby::Lobby(Core::System& system_, QWidget* parent, QStandardItemModel* list,
 
     // UI Buttons
     connect(ui->refresh_list, &QPushButton::clicked, this, &Lobby::RefreshLobby);
+    connect(ui->search, &QLineEdit::textChanged, proxy, &LobbyFilterProxyModel::SetFilterSearch);
     connect(ui->games_owned, &QCheckBox::toggled, proxy, &LobbyFilterProxyModel::SetFilterOwned);
     connect(ui->hide_empty, &QCheckBox::toggled, proxy, &LobbyFilterProxyModel::SetFilterEmpty);
     connect(ui->hide_full, &QCheckBox::toggled, proxy, &LobbyFilterProxyModel::SetFilterFull);
-    connect(ui->search, &QLineEdit::textChanged, proxy, &LobbyFilterProxyModel::SetFilterSearch);
     connect(ui->room_list, &QTreeView::doubleClicked, this, &Lobby::OnJoinRoom);
     connect(ui->room_list, &QTreeView::clicked, this, &Lobby::OnExpandRoom);
 
@@ -74,6 +74,12 @@ Lobby::Lobby(Core::System& system_, QWidget* parent, QStandardItemModel* list,
     connect(&room_list_watcher, &QFutureWatcher<AnnounceMultiplayerRoom::RoomList>::finished, this,
             &Lobby::OnRefreshLobby);
 
+    // Load persistent filters after events are connected to make sure they apply
+    ui->search->setText(UISettings::values.multiplayer_filter_text);
+    ui->games_owned->setChecked(UISettings::values.multiplayer_filter_games_owned);
+    ui->hide_empty->setChecked(UISettings::values.multiplayer_filter_hide_empty);
+    ui->hide_full->setChecked(UISettings::values.multiplayer_filter_hide_full);
+
     // manually start a refresh when the window is opening
     // TODO(jroweboy): if this refresh is slow for people with bad internet, then don't do it as
     // part of the constructor, but offload the refresh until after the window shown. perhaps emit a
@@ -180,6 +186,10 @@ void Lobby::OnJoinRoom(const QModelIndex& source) {
     UISettings::values.nickname = ui->nickname->text();
     UISettings::values.ip = proxy->data(connection_index, LobbyItemHost::HostIPRole).toString();
     UISettings::values.port = proxy->data(connection_index, LobbyItemHost::HostPortRole).toString();
+    UISettings::values.multiplayer_filter_text = ui->search->text();
+    UISettings::values.multiplayer_filter_games_owned = ui->games_owned->isChecked();
+    UISettings::values.multiplayer_filter_hide_empty = ui->hide_empty->isChecked();
+    UISettings::values.multiplayer_filter_hide_full = ui->hide_full->isChecked();
 }
 
 void Lobby::ResetModel() {

src/citra_qt/multiplayer/lobby_p.h

@@ -188,12 +188,37 @@ public:
     }
 
     QVariant data(int role) const override {
-        if (role != Qt::DisplayRole) {
+        switch (role) {
+        case Qt::DisplayRole: {
+            auto members = data(MemberListRole).toList();
+            return QStringLiteral("%1 / %2").arg(QString::number(members.size()),
+                                                 data(MaxPlayerRole).toString());
+        }
+        case Qt::ForegroundRole: {
+            auto members = data(MemberListRole).toList();
+            auto max_players = data(MaxPlayerRole).toInt();
+            const QColor room_full_color(255, 48, 32);
+            const QColor room_almost_full_color(255, 140, 32);
+            const QColor room_has_players_color(32, 160, 32);
+            const QColor room_empty_color(128, 128, 128);
+
+            if (members.size() >= max_players) {
+                return QBrush(room_full_color);
+            } else if (members.size() == (max_players - 1)) {
+                return QBrush(room_almost_full_color);
+            } else if (members.size() == 0) {
+                return QBrush(room_empty_color);
+            } else if (members.size() > 0 && members.size() < (max_players - 1)) {
+                return QBrush(room_has_players_color);
+            }
+
+            // FIXME: How to return a value that tells Qt not to modify the
+            // text color from the default (as if Qt::ForegroundRole wasn't overridden)?
+            return QBrush(nullptr);
+        }
+        default:
             return LobbyItem::data(role);
         }
-        auto members = data(MemberListRole).toList();
-        return QStringLiteral("%1 / %2").arg(QString::number(members.size()),
-                                             data(MaxPlayerRole).toString());
     }
 
     bool operator<(const QStandardItem& other) const override {