Add note for --new-tab command line help

CCBUG: 373440

src/Application.cpp

@@ -55,7 +55,8 @@ void Application::populateCommandLineParser(QCommandLineParser *parser)
         {{QStringLiteral("fallback-profile")}, i18nc("@info:shell", "Use the internal FALLBACK profile")},
         {{QStringLiteral("workdir")}, i18nc("@info:shell", "Set the initial working directory of the new tab or window to 'dir'"), QStringLiteral("dir")},
         {{QStringLiteral("hold"), QStringLiteral("noclose")}, i18nc("@info:shell", "Do not close the initial session automatically when it ends.")},
-        {{QStringLiteral("new-tab")}, i18nc("@info:shell", "Create a new tab in an existing window rather than creating a new window")},
+        // BR: 373440
+        {{QStringLiteral("new-tab")}, i18nc("@info:shell", "Create a new tab in an existing window rather than creating a new window ('Run all Konsole windows in a single process' must be enabled)")},
         {{QStringLiteral("tabs-from-file")}, i18nc("@info:shell", "Create tabs as specified in given tabs configuration file"), QStringLiteral("file")},
         {{QStringLiteral("background-mode")},
          i18nc("@info:shell", "Start Konsole in the background and bring to the front when Ctrl+Shift+F12 (by default) is pressed")},