From 813c16854df6be7fd1f1a8013d0b180f6248e5ab Mon Sep 17 00:00:00 2001
From: Jonathan Liu <net147@gmail.com>
Date: Thu, 20 Sep 2018 13:48:58 +1000
Subject: SshDeviceProcess: Don't emit readyRead signals if no data available

Task-number: QTCREATORBUG-19367
Change-Id: I477800b2e2060748c2b5f9fde3acc91d9f5ae176
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
---
 src/plugins/projectexplorer/devicesupport/sshdeviceprocess.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/plugins/projectexplorer/devicesupport/sshdeviceprocess.cpp b/src/plugins/projectexplorer/devicesupport/sshdeviceprocess.cpp
index b34e0ce805..3bb813d55d 100644
--- a/src/plugins/projectexplorer/devicesupport/sshdeviceprocess.cpp
+++ b/src/plugins/projectexplorer/devicesupport/sshdeviceprocess.cpp
@@ -245,13 +245,19 @@ void SshDeviceProcess::handleProcessFinished(int exitStatus)
 
 void SshDeviceProcess::handleStdout()
 {
-    d->stdOut += d->process->readAllStandardOutput();
+    QByteArray output = d->process->readAllStandardOutput();
+    if (output.isEmpty())
+        return;
+    d->stdOut += output;
     emit readyReadStandardOutput();
 }
 
 void SshDeviceProcess::handleStderr()
 {
-    d->stdErr += d->process->readAllStandardError();
+    QByteArray output = d->process->readAllStandardError();
+    if (output.isEmpty())
+        return;
+    d->stdErr += output;
     emit readyReadStandardError();
 }
 
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