QtcProcess: Don't read error channel when MergedChannels

Fixes: QTCREATORBUG-27383
Change-Id: I5034c50fc876c5580148bb7806479da3163b08fc
Reviewed-by: Robert Löhning <robert.loehning@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: hjk <hjk@qt.io>

1 files changed, 6 insertions, 1 deletions

diff --git a/src/libs/utils/qtcprocess.cpp b/src/libs/utils/qtcprocess.cpp
index 6e2e38ff7a..63af544cf2 100644
--- a/src/libs/utils/qtcprocess.cpp
+++ b/src/libs/utils/qtcprocess.cpp
@@ -378,7 +378,12 @@ public:
     }
 
     QByteArray readAllStandardOutput() override { return m_process->readAllStandardOutput(); }
-    QByteArray readAllStandardError() override { return m_process->readAllStandardError(); }
+    QByteArray readAllStandardError() override
+    {
+        if (m_process->processChannelMode() == QProcess::MergedChannels)
+            return {};
+        return m_process->readAllStandardError();
+    }
 
     void setProcessEnvironment(const QProcessEnvironment &environment) override
     { m_process->setProcessEnvironment(environment); }