[LyX/master] Yet another deprecation fix (this is the last one I am aware of)

[Juergen Spitzmueller]

commit 9f92fc92bdd41c367b0975454a01c15403d51a60
Author: Juergen Spitzmueller <sp...@lyx.org>
Date:   Fri Mar 12 12:14:42 2021 +0100

    Yet another deprecation fix (this is the last one I am aware of)
---
 src/support/Systemcall.cpp |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/src/support/Systemcall.cpp b/src/support/Systemcall.cpp
index 815223d..00adbf8 100644
--- a/src/support/Systemcall.cpp
+++ b/src/support/Systemcall.cpp
@@ -368,6 +368,15 @@ void SystemcallPrivate::startProcess(QString const & cmd, 
string const & path,
                                      string const & lpath, bool detached)
 {
        cmd_ = cmd;
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
+       // FIXME pass command and arguments separated in the first place
+       QStringList arguments = 
QProcess::splitCommand(toqstr(latexEnvCmdPrefix(path, lpath)) + cmd_);
+       QString command = (arguments.empty()) ? QString() : arguments.first();
+       if (arguments.size() == 1)
+               arguments.clear();
+       else if (!arguments.empty())
+               arguments.removeFirst();
+#endif
        if (detached) {
                state = SystemcallPrivate::Running;
 #ifdef Q_OS_WIN32
@@ -379,7 +388,11 @@ void SystemcallPrivate::startProcess(QString const & cmd, 
string const & path,
                if (err_file_.empty())
                        process_->setStandardErrorFile(QProcess::nullDevice());
 #endif
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
+               if (!QProcess::startDetached(command, arguments)) {
+#else
                if (!QProcess::startDetached(toqstr(latexEnvCmdPrefix(path, 
lpath)) + cmd_)) {
+#endif
                        state = SystemcallPrivate::Error;
                        return;
                }
@@ -387,7 +400,11 @@ void SystemcallPrivate::startProcess(QString const & cmd, 
string const & path,
                delete released;
        } else if (process_) {
                state = SystemcallPrivate::Starting;
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
+               process_->start(command, arguments);
+#else
                process_->start(toqstr(latexEnvCmdPrefix(path, lpath)) + cmd_);
+#endif
        }
 }
 
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