[plasma/plasma-login-manager] src: drop unused DisplayServerFailed path

Git commit 76b0bccb75b2836b795d6b83303fd23fd68e950f by David Edmundson.
Committed on 20/07/2026 at 12:16.
Pushed by davidedmundson into branch 'master'.

drop unused DisplayServerFailed path

This is a relic from the X11 days when we launched the display server.
The greeter no longer emits it.

M  +0    -1    src/auth/Auth.h
M  +0    -1    src/daemon/Display.cpp
M  +0    -1    src/daemon/Display.h
M  +1    -3    src/daemon/Greeter.cpp
M  +4    -23   src/daemon/Seat.cpp
M  +0    -3    src/daemon/Seat.h

https://invent.kde.org/plasma/plasma-login-manager/-/commit/76b0bccb75b2836b795d6b83303fd23fd68e950f

diff --git a/src/auth/Auth.h b/src/auth/Auth.h
index 1e97de94..bc95301e 100644
--- a/src/auth/Auth.h
+++ b/src/auth/Auth.h
@@ -67,7 +67,6 @@ public:
         HELPER_AUTH_ERROR,
         HELPER_SESSION_ERROR,
         HELPER_OTHER_ERROR,
-        HELPER_DISPLAYSERVER_ERROR,
         HELPER_TTY_ERROR,
     };
     Q_ENUM(HelperExitStatus)
diff --git a/src/daemon/Display.cpp b/src/daemon/Display.cpp
index e5065ae3..875ceaf1 100644
--- a/src/daemon/Display.cpp
+++ b/src/daemon/Display.cpp
@@ -87,7 +87,6 @@ Display::Display(Seat *parent)
         VirtualTerminal::jumpToVt(PLASMALOGIN_INITIAL_VT, true);
         stop();
     });
-    connect(m_greeter, &Greeter::displayServerFailed, this, &Display::displayServerFailed);
 
     // Per-seat autologin: a seat with its own [Autologin][<seat>] subgroup is logged in as that
     // subgroup's User running its Session, so a dedicated seat can be driven by the login manager
diff --git a/src/daemon/Display.h b/src/daemon/Display.h
index 762b2e64..c267e3db 100644
--- a/src/daemon/Display.h
+++ b/src/daemon/Display.h
@@ -63,7 +63,6 @@ public slots:
 
 signals:
     void stopped();
-    void displayServerFailed();
 
     void loginFailed(QLocalSocket *socket);
     void loginSucceeded(QLocalSocket *socket);
diff --git a/src/daemon/Greeter.cpp b/src/daemon/Greeter.cpp
index 8bc8203c..47521cf8 100644
--- a/src/daemon/Greeter.cpp
+++ b/src/daemon/Greeter.cpp
@@ -195,9 +195,7 @@ void Greeter::onHelperFinished(Auth::HelperExitStatus status)
     m_auth->deleteLater();
     m_auth = nullptr;
 
-    if (status == Auth::HELPER_DISPLAYSERVER_ERROR) {
-        Q_EMIT displayServerFailed();
-    } else if (status == Auth::HELPER_TTY_ERROR) {
+    if (status == Auth::HELPER_TTY_ERROR) {
         Q_EMIT ttyFailed();
     } else if (status == Auth::HELPER_SESSION_ERROR) {
         Q_EMIT failed();
diff --git a/src/daemon/Seat.cpp b/src/daemon/Seat.cpp
index 8f5a59be..515a079f 100644
--- a/src/daemon/Seat.cpp
+++ b/src/daemon/Seat.cpp
@@ -147,11 +147,6 @@ void Seat::createDisplay()
 
     // restart display on stop
     connect(display, &Display::stopped, this, &Seat::displayStopped);
-    connect(display, &Display::displayServerFailed, this, [this, display] {
-        removeDisplay(display);
-        qWarning() << "Failed to launch a display server";
-        QCoreApplication::instance()->exit(12);
-    });
 
     // add display to the list
     m_displays << display;
@@ -181,30 +176,16 @@ void Seat::startDisplay(Display *display, int tryNr)
     });
 }
 
-void Seat::removeDisplay(Display *display)
-{
-    qDebug() << "Removing display" << display << "...";
-
-    // remove display from list
-    m_displays.removeAll(display);
-
-    // stop the display
-    display->blockSignals(true);
-    display->stop();
-    display->blockSignals(false);
-
-    // delete display
-    display->deleteLater();
-}
-
 void Seat::displayStopped()
 {
     Display *display = qobject_cast<Display *>(sender());
     std::optional<int> nextVt;
     nextVt = vtForSession(display->reuseSessionId());
 
-    // remove display
-    removeDisplay(display);
+    // remove display from list
+    m_displays.removeAll(display);
+    // delete display
+    display->deleteLater();
 
     // restart otherwise
     if (m_displays.isEmpty()) {
diff --git a/src/daemon/Seat.h b/src/daemon/Seat.h
index 34b52c14..1f562cdd 100644
--- a/src/daemon/Seat.h
+++ b/src/daemon/Seat.h
@@ -42,9 +42,6 @@ public:
     void activateSession(const QString &sessionId) const;
     std::optional<int> vtForSession(const QString &sessionId) const;
 
-public slots:
-    void removeDisplay(PLASMALOGIN::Display *display);
-
 private slots:
     void displayStopped();