config/qt.m4

@@ -217,15 +217,31 @@ AC_DEFUN([QT_DO_IT_ALL],
 	     fi;;
 	esac
 
-	dnl Specific support for X11 will be built if these are available
-	AC_CHECK_HEADERS([xcb/xcb.h])
-	AC_CHECK_LIB([xcb], [xcb_send_event])
 
 	save_CPPFLAGS=$CPPFLAGS
 	CPPFLAGS="$save_CPPFLAGS $QT_CORE_INCLUDES"
 	AC_CHECK_HEADER(QtGui/qtgui-config.h,
 	  [lyx_qt_config=QtGui/qtgui-config.h],
 	  [lyx_qt_config=qconfig.h])
+	AC_MSG_CHECKING([whether Qt uses the X Window system])
+	if test x$USE_QT6 = xyes ; then
+	  dnl FIXME: Check whether defining QPA_XCB makes sense with Qt6
+	  AC_PREPROC_IFELSE([AC_LANG_SOURCE([
+	    [#include <$lyx_qt_config>]
+	    [#if !defined(QT_FEATURE_xcb) || QT_FEATURE_xcb < 0]
+	    [#error Fail]
+	    [#endif]])],
+	    [AC_MSG_RESULT(yes)
+	     AC_DEFINE(QPA_XCB, 1, [Define if Qt uses the X Window System])],
+	    [AC_MSG_RESULT(no)])
+	else
+	  AC_EGREP_CPP(xcb,
+	    [#include <$lyx_qt_config>
+	    QT_QPA_DEFAULT_PLATFORM_NAME],
+	    [AC_MSG_RESULT(yes)
+	     AC_DEFINE(QPA_XCB, 1, [Define if Qt uses the X Window System])],
+	    [AC_MSG_RESULT(no)])
+	fi
 	CPPFLAGS=$save_CPPFLAGS
 
 	QT_FIND_TOOL([QT_MOC], [moc])

src/LyX.cpp

@@ -127,6 +127,8 @@ namespace {
 string cl_system_support;
 string cl_user_support;
 
+string geometryArg;
+
 LyX * singleton_ = nullptr;
 
 void showFileError(string const & error)
@@ -609,7 +611,7 @@ void LyX::execCommands()
 	}
 
 	// create the first main window
-	lyx::dispatch(FuncRequest(LFUN_WINDOW_NEW));
+	lyx::dispatch(FuncRequest(LFUN_WINDOW_NEW, geometryArg));
 
 	if (!pimpl_->files_to_load_.empty()) {
 		// if some files were specified at command-line we assume that the
@@ -1340,6 +1342,20 @@ int parse_import(string const & type, string const & file, string & batch)
 }
 
 
+int parse_geometry(string const & arg1, string const &, string &)
+{
+	geometryArg = arg1;
+#if !defined(QPA_XCB)
+	// don't remove "-geometry", it will be pruned out later in the
+	// frontend if need be.
+	return -1;
+#else
+	// but that is only done if QPA_XCB is not defined.
+	return 1;
+#endif
+}
+
+
 int parse_batch(string const &, string const &, string &)
 {
 	use_gui = false;
@@ -1417,6 +1433,7 @@ void LyX::easyParse(int & argc, char * argv[])
 	cmdmap["--export-to"] = parse_export_to;
 	cmdmap["-i"] = parse_import;
 	cmdmap["--import"] = parse_import;
+	cmdmap["-geometry"] = parse_geometry;
 	cmdmap["-batch"] = parse_batch;
 	cmdmap["-f"] = parse_force;
 	cmdmap["--force-overwrite"] = parse_force;
@@ -1429,10 +1446,6 @@ void LyX::easyParse(int & argc, char * argv[])
 	cmdmap["--ignore-error-message"] = parse_ignore_error_message;
 
 	for (int i = 1; i < argc; ++i) {
-		// Let Qt handle -geometry even when not on X11.
-		if (from_utf8(argv[i]) == "-geometry")
-			argv[i] = const_cast<char *>("-qwindowgeometry");
-
 		map<string, cmd_helper>::const_iterator it
 			= cmdmap.find(argv[i]);
 

src/frontends/qt/GuiApplication.cpp

@@ -121,7 +121,7 @@
 #include <QThreadPool>
 #include <QWidget>
 
-#ifdef HAVE_XCB_XCB_H
+#if defined(QPA_XCB)
 #include <xcb/xcb.h>
 #ifdef HAVE_QT5_X11_EXTRAS
 #include <QtX11Extras/QX11Info>
@@ -172,6 +172,20 @@ namespace lyx {
 
 frontend::Application * createApplication(int & argc, char * argv[])
 {
+#if !defined(QPA_XCB)
+	// prune -geometry argument(s) by shifting
+	// the following ones 2 places down.
+	for (int i = 0 ; i < argc ; ++i) {
+		if (strcmp(argv[i], "-geometry") == 0) {
+			int const remove = (i+1) < argc ? 2 : 1;
+			argc -= remove;
+			for (int j = i; j < argc; ++j)
+				argv[j] = argv[j + remove];
+			--i;
+		}
+	}
+#endif
+
 #if defined(Q_OS_WIN) || defined(Q_CYGWIN_WIN)
 	// On Windows, allow bringing the LyX window to top
 	AllowSetForegroundWindow(ASFW_ANY);
@@ -1157,14 +1171,10 @@ GuiApplication::GuiApplication(int & argc, char ** argv)
 	// Install Qt native translator for GUI elements.
 	installTranslator(&d->qt_trans_);
 
-	if (platformName() == "xcb") {
-#if defined(HAVE_XCB_XCB_H) && defined(HAVE_LIBXCB)
-		// Enable reception of XCB events.
-		installNativeEventFilter(this);
-#else
-		LYXERR0("Warning: X11 support is incomplete in this LyX binary.");
+#ifdef QPA_XCB
+	// Enable reception of XCB events.
+	installNativeEventFilter(this);
 #endif
-	}
 
 	// FIXME: quitOnLastWindowClosed is true by default. We should have a
 	// lyxrc setting for this in order to let the application stay resident.
@@ -1185,13 +1195,13 @@ GuiApplication::GuiApplication(int & argc, char ** argv)
 			this, SLOT(onApplicationStateChanged(Qt::ApplicationState)));
 #endif
 
-	if (platformName() == "xcb") {
-		// doubleClickInterval() is 400 ms on X11 which is just too long.
-		// On Windows and Mac OS X, the operating system's value is used.
-		// On Microsoft Windows, calling this function sets the double
-		// click interval for all applications. So we don't!
-		QApplication::setDoubleClickInterval(300);
-	}
+#if defined(QPA_XCB)
+	// doubleClickInterval() is 400 ms on X11 which is just too long.
+	// On Windows and Mac OS X, the operating system's value is used.
+	// On Microsoft Windows, calling this function sets the double
+	// click interval for all applications. So we don't!
+	QApplication::setDoubleClickInterval(300);
+#endif
 
 	connect(this, SIGNAL(lastWindowClosed()), this, SLOT(onLastWindowClosed()));
 
@@ -3502,7 +3512,7 @@ bool GuiApplication::longOperationStarted() {
 //
 // X11 specific stuff goes here...
 
-#if defined(HAVE_XCB_XCB_H) && defined(HAVE_LIBXCB)
+#if defined(QPA_XCB)
 bool GuiApplication::nativeEventFilter(const QByteArray & eventType,
 				       void * message, QINTPTR *)
 {

src/frontends/qt/GuiApplication.h

@@ -20,7 +20,7 @@
 
 #include <QApplication>
 #include <QList>
-#if defined(HAVE_XCB_XCB_H) && defined(HAVE_LIBXCB)
+#ifdef QPA_XCB
 #include <QAbstractNativeEventFilter>
 #endif
 
@@ -53,7 +53,7 @@ There should be only one instance of this class. No Qt object
 initialisation should be done before the instantiation of this class.
 */
 class GuiApplication : public QApplication, public Application
-#if defined(HAVE_XCB_XCB_H) && defined(HAVE_LIBXCB)
+#ifdef QPA_XCB
 		     , public QAbstractNativeEventFilter
 #endif
 {
@@ -121,7 +121,7 @@ public:
 	//@{
 	bool notify(QObject * receiver, QEvent * event) override;
 	void commitData(QSessionManager & sm);
-#if defined(HAVE_XCB_XCB_H) && defined(HAVE_LIBXCB)
+#if defined(QPA_XCB)
 #if (QT_VERSION < 0x060000)
 #define QINTPTR long
 #else