Terminal: Fix opening terminals on remote devices

When the active project is on a remote device the working directory
is set to its root directory. In this case we need to find the right shell
binary from the remote device.

Change-Id: I6b541273d23a8de5442ac041b28d81984ed5ef65
Reviewed-by: Cristian Adam <cristian.adam@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

src/plugins/terminal/terminalpane.cpp

@@ -106,6 +106,17 @@ void TerminalPane::openTerminal(const OpenTerminalParameters &parameters)
         }
     }
 
+    if (parametersCopy.workingDirectory->needsDevice() && !parametersCopy.shellCommand) {
+        const FilePath shell = parametersCopy.workingDirectory->withNewPath(
+            parametersCopy.environment
+                .value_or(parametersCopy.workingDirectory->deviceEnvironment())
+                .value_or("SHELL", "/bin/sh"));
+        if (!shell.isExecutableFile())
+            parametersCopy.workingDirectory.reset();
+        else
+            parametersCopy.shellCommand = CommandLine{shell, {}};
+    }
+
     const auto terminalWidget = new TerminalWidget(&m_tabWidget, parametersCopy);
 
     using namespace Constants;