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diff --git a/vcl/unx/generic/desktopdetect/desktopdetector.cxx b/vcl/unx/generic/desktopdetect/desktopdetector.cxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <X11/Xlib.h>
+
+#include <unx/desktops.hxx>
+
+#include <rtl/bootstrap.hxx>
+#include <rtl/process.h>
+#include <osl/thread.h>
+
+#include <vclpluginapi.h>
+
+#include <string.h>
+#include <comphelper/string.hxx>
+
+static bool is_gnome_desktop( Display* pDisplay )
+{
+
+ // warning: these checks are coincidental, GNOME does not
+ // explicitly advertise itself
+ if ( getenv( "GNOME_DESKTOP_SESSION_ID" ) )
+ return true;
+
+ bool ret = false;
+
+ Atom nAtom1 = XInternAtom( pDisplay, "GNOME_SM_PROXY", True );
+ Atom nAtom2 = XInternAtom( pDisplay, "NAUTILUS_DESKTOP_WINDOW_ID", True );
+ if( nAtom1 || nAtom2 )
+ {
+ int nProperties = 0;
+ Atom* pProperties = XListProperties( pDisplay, DefaultRootWindow( pDisplay ), &nProperties );
+ if( pProperties && nProperties )
+ {
+ for( int i = 0; i < nProperties; i++ )
+ if( pProperties[ i ] == nAtom1 ||
+ pProperties[ i ] == nAtom2 )
+ {
+ ret = true;
+ break;
+ }
+ XFree( pProperties );
+ }
+ }
+ if (ret)
+ return true;
+
+ Atom nUTFAtom = XInternAtom( pDisplay, "UTF8_STRING", True );
+ Atom nNetWMNameAtom = XInternAtom( pDisplay, "_NET_WM_NAME", True );
+ if( nUTFAtom && nNetWMNameAtom )
+ {
+ // another, more expensive check: search for a gnome-panel
+ ::Window aRoot, aParent, *pChildren = nullptr;
+ unsigned int nChildren = 0;
+ XQueryTree( pDisplay, DefaultRootWindow( pDisplay ),
+ &aRoot, &aParent, &pChildren, &nChildren );
+ if( pChildren && nChildren )
+ {
+ for( unsigned int i = 0; i < nChildren && ! ret; i++ )
+ {
+ Atom nType = None;
+ int nFormat = 0;
+ unsigned long nItems = 0, nBytes = 0;
+ unsigned char* pProp = nullptr;
+ XGetWindowProperty( pDisplay,
+ pChildren[i],
+ nNetWMNameAtom,
+ 0, 8,
+ False,
+ nUTFAtom,
+ &nType,
+ &nFormat,
+ &nItems,
+ &nBytes,
+ &pProp );
+ if( pProp && nType == nUTFAtom )
+ {
+ OString aWMName( reinterpret_cast<char*>(pProp) );
+ if (
+ (aWMName.equalsIgnoreAsciiCase("gnome-shell")) ||
+ (aWMName.equalsIgnoreAsciiCase("gnome-panel"))
+ )
+ {
+ ret = true;
+ }
+ }
+ if( pProp )
+ XFree( pProp );
+ }
+ XFree( pChildren );
+ }
+ }
+
+ return ret;
+}
+
+static bool is_plasma5_desktop()
+{
+ static const char* pFullVersion = getenv("KDE_FULL_SESSION");
+ static const char* pSessionVersion = getenv("KDE_SESSION_VERSION");
+ return pFullVersion && pSessionVersion && (0 == strcmp(pSessionVersion, "5"));
+}
+
+extern "C"
+{
+
+DESKTOP_DETECTOR_PUBLIC DesktopType get_desktop_environment()
+{
+ static const char *pOverride = getenv( "OOO_FORCE_DESKTOP" );
+
+ if ( pOverride && *pOverride )
+ {
+ OString aOver( pOverride );
+
+ if ( aOver.equalsIgnoreAsciiCase( "lxqt" ) )
+ return DESKTOP_LXQT;
+ if (aOver.equalsIgnoreAsciiCase("plasma5") || aOver.equalsIgnoreAsciiCase("plasma"))
+ return DESKTOP_PLASMA5;
+ if ( aOver.equalsIgnoreAsciiCase( "gnome" ) )
+ return DESKTOP_GNOME;
+ if ( aOver.equalsIgnoreAsciiCase( "gnome-wayland" ) )
+ return DESKTOP_GNOME;
+ if ( aOver.equalsIgnoreAsciiCase( "unity" ) )
+ return DESKTOP_UNITY;
+ if ( aOver.equalsIgnoreAsciiCase( "xfce" ) )
+ return DESKTOP_XFCE;
+ if ( aOver.equalsIgnoreAsciiCase( "mate" ) )
+ return DESKTOP_MATE;
+ if ( aOver.equalsIgnoreAsciiCase( "none" ) )
+ return DESKTOP_UNKNOWN;
+ }
+
+ OUString plugin;
+ rtl::Bootstrap::get("SAL_USE_VCLPLUGIN", plugin);
+
+ if (plugin == "svp")
+ return DESKTOP_NONE;
+
+ const char *pDesktop = getenv( "XDG_CURRENT_DESKTOP" );
+ if ( pDesktop )
+ {
+ OString aCurrentDesktop( pDesktop, strlen( pDesktop ) );
+
+ //it may be separated by colon ( e.g. unity:unity7:ubuntu )
+ std::vector<OUString> aSplitCurrentDesktop = comphelper::string::split(
+ OStringToOUString( aCurrentDesktop, RTL_TEXTENCODING_UTF8), ':');
+ for (const auto& rCurrentDesktopStr : aSplitCurrentDesktop)
+ {
+ if ( rCurrentDesktopStr.equalsIgnoreAsciiCase( "unity" ) )
+ return DESKTOP_UNITY;
+ else if ( rCurrentDesktopStr.equalsIgnoreAsciiCase( "gnome" ) )
+ return DESKTOP_GNOME;
+ else if ( rCurrentDesktopStr.equalsIgnoreAsciiCase( "lxqt" ) )
+ return DESKTOP_LXQT;
+ }
+ }
+
+ const char *pSession = getenv( "DESKTOP_SESSION" );
+ OString aDesktopSession;
+ if ( pSession )
+ aDesktopSession = OString( pSession, strlen( pSession ) );
+
+ // fast environment variable checks
+ if ( aDesktopSession.equalsIgnoreAsciiCase( "gnome" ) )
+ return DESKTOP_GNOME;
+ else if ( aDesktopSession.equalsIgnoreAsciiCase( "gnome-wayland" ) )
+ return DESKTOP_GNOME;
+ else if ( aDesktopSession.equalsIgnoreAsciiCase( "mate" ) )
+ return DESKTOP_MATE;
+ else if ( aDesktopSession.equalsIgnoreAsciiCase( "xfce" ) )
+ return DESKTOP_XFCE;
+ else if ( aDesktopSession.equalsIgnoreAsciiCase( "lxqt" ) )
+ return DESKTOP_LXQT;
+
+ if (is_plasma5_desktop())
+ return DESKTOP_PLASMA5;
+
+ // tdf#121275 if we still can't tell, and WAYLAND_DISPLAY
+ // is set, default to gtk3
+ const char* pWaylandStr = getenv("WAYLAND_DISPLAY");
+ if (pWaylandStr && *pWaylandStr)
+ return DESKTOP_GNOME;
+
+ // these guys can be slower, with X property fetches,
+ // round-trips etc. and so are done later.
+
+ // get display to connect to
+ const char* pDisplayStr = getenv( "DISPLAY" );
+
+ int nParams = rtl_getAppCommandArgCount();
+ OUString aParam;
+ OString aBParm;
+ for( int i = 0; i < nParams; i++ )
+ {
+ rtl_getAppCommandArg( i, &aParam.pData );
+ if( i < nParams-1 && (aParam == "-display" || aParam == "--display" ) )
+ {
+ rtl_getAppCommandArg( i+1, &aParam.pData );
+ aBParm = OUStringToOString( aParam, osl_getThreadTextEncoding() );
+ pDisplayStr = aBParm.getStr();
+ break;
+ }
+ }
+
+ // no server at all
+ if( ! pDisplayStr || !*pDisplayStr )
+ return DESKTOP_NONE;
+
+
+ /* #i92121# workaround deadlocks in the X11 implementation
+ */
+ static const char* pNoXInitThreads = getenv( "SAL_NO_XINITTHREADS" );
+ /* #i90094#
+ from now on we know that an X connection will be
+ established, so protect X against itself
+ */
+ if( ! ( pNoXInitThreads && *pNoXInitThreads ) )
+ XInitThreads();
+
+ Display* pDisplay = XOpenDisplay( pDisplayStr );
+ if( pDisplay == nullptr )
+ return DESKTOP_NONE;
+
+ DesktopType ret;
+ if ( is_gnome_desktop( pDisplay ) )
+ ret = DESKTOP_GNOME;
+ else
+ ret = DESKTOP_UNKNOWN;
+
+ XCloseDisplay( pDisplay );
+
+ return ret;
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */