Prevent passing invalid working directories in some places

QProcess fails silently when given an invalid working directory, so
don't allow that to happen.

Fixes: QTCREATORBUG-32841
Change-Id: Id3309054569625a6224e9452d3b2164836cf5160
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/qtcprocess.cpp

@@ -377,12 +377,17 @@ public:
             penv = Environment::systemEnvironment().toProcessEnvironment();
         const QStringList senv = penv.toStringList();
 
+        FilePath workingDir = m_setup.m_workingDirectory;
+        if (!workingDir.isDir())
+            workingDir = workingDir.parentDir();
+        if (!QTC_GUARD(workingDir.exists()))
+            workingDir = workingDir.withNewPath({});
         bool startResult = m_ptyProcess->startProcess(executable,
                                                       HostOsInfo::isWindowsHost()
                                                           ? QStringList{m_setup.m_nativeArguments}
                                                                 << arguments
                                                           : arguments,
-                                                      m_setup.m_workingDirectory.nativePath(),
+                                                      workingDir.nativePath(),
                                                       senv,
                                                       m_setup.m_ptyData->size().width(),
                                                       m_setup.m_ptyData->size().height());

src/plugins/projectexplorer/devicesupport/desktopdevice.cpp

@@ -66,7 +66,11 @@ DesktopDevice::DesktopDevice()
         process.setTerminalMode(TerminalMode::Detached);
         process.setEnvironment(realEnv);
         process.setCommand(CommandLine{*shell});
-        process.setWorkingDirectory(path);
+        FilePath workingDir = path;
+        if (!workingDir.isDir())
+            workingDir = workingDir.parentDir();
+        if (QTC_GUARD(workingDir.exists()))
+            process.setWorkingDirectory(workingDir);
         process.start();
 
         return {};