Improve terminal theming, cursor UX, and size negotiation

src/ssh_session_backend.cpp

@@ -25,7 +25,9 @@ SshSessionBackend::SshSessionBackend(const Profile& profile, QObject* parent)
       m_reconnectPending(false),
       m_waitingForPasswordPrompt(false),
       m_waitingForHostKeyConfirmation(false),
-      m_passwordSubmitted(false)
+      m_passwordSubmitted(false),
+      m_terminalColumns(0),
+      m_terminalRows(0)
 {
     m_connectedProbeTimer->setSingleShot(true);
 
@@ -152,6 +154,16 @@ void SshSessionBackend::confirmHostKey(bool trustHost)
                          : QStringLiteral("Host key rejected by user."));
 }
 
+void SshSessionBackend::updateTerminalSize(int columns, int rows)
+{
+    m_terminalColumns = columns;
+    m_terminalRows = rows;
+
+    if (m_state == SessionState::Connected) {
+        applyTerminalSizeIfAvailable();
+    }
+}
+
 void SshSessionBackend::onProcessStarted()
 {
     emit eventLogged(QStringLiteral("ssh process started."));
@@ -284,6 +296,10 @@ void SshSessionBackend::setState(SessionState state, const QString& message)
     m_state = state;
     emit stateChanged(state, message);
     emit eventLogged(message);
+
+    if (m_state == SessionState::Connected) {
+        applyTerminalSizeIfAvailable();
+    }
 }
 
 bool SshSessionBackend::startSshProcess(const SessionConnectOptions& options)
@@ -502,3 +518,21 @@ QString SshSessionBackend::knownHostsFileForNullDevice() const
     return QStringLiteral("/dev/null");
 #endif
 }
+
+void SshSessionBackend::applyTerminalSizeIfAvailable()
+{
+    if (m_process->state() != QProcess::Running) {
+        return;
+    }
+
+    if (m_terminalColumns <= 0 || m_terminalRows <= 0) {
+        return;
+    }
+
+    const QString command = QStringLiteral("stty cols %1 rows %2\\n")
+                                .arg(m_terminalColumns)
+                                .arg(m_terminalRows);
+    m_process->write(command.toUtf8());
+    emit eventLogged(
+        QStringLiteral("Applied terminal size: %1x%2").arg(m_terminalColumns).arg(m_terminalRows));
+}