Source mapping not working if a folder inside the project root is given

Environment

• OS and version: Windows 111
• VS Code: 1.96.4
• C/C++ extension:1.23.4
• GDB / LLDB version:13.2

Bug Summary and Steps to Reproduce

Bug Summary:
SourceMapping is not working if I tried to map a folder inside the project root directory.

Ie: : is working but /src:/src is not working.

Steps to reproduce:

1. I've used a C/C++ project built using eclipse. I build it inside a folder and moved the entire folder to another location.
2. Created a launch configuration for qemu using the relocated project and it's elf
3. Mapped source till /src folder and debug
4. I got The editor could not be opened because the file was not found in the editor. I was expecting the editor opens the mapped source file.

engine_debug_log.txt

Debugger Configurations

{
    "configurations": [
        {
           "logging": { "engineLogging": true, "trace": true, "traceResponse": true },
            "name": "test-qemu",
            "type": "cppdbg",
            "request": "launch",
            "program": "c:\\Users\\Ashling\\AppData\\Local\\Ashling\\qemu32_baremetal\\Debug\\qemu32_baremetal.elf",
            "args": [],
            "stopAtConnect": true,
            "stopAtEntry": true,
            "cwd": "c:\\Users\\Ashling\\AppData\\Local\\Ashling\\qemu32_baremetal",
            "environment": [],
            "externalConsole": false,
            "MIMode": "gdb",
            "miDebuggerPath": "riscv32-unknown-elf-gdb.exe",
            "setupCommands": [
                {
                    "description": "Enable pretty-printing for gdb",
                    "text": "-enable-pretty-printing",
                    "ignoreFailures": true
                },
                {
                    "description": "Set RISC-V architecture",
                    "text": "set arch riscv:rv32",
                    "ignoreFailures": true
                },
                {
                    "description": "Set remote timeout",
                    "text": "set remotetimeout 250",
                    "ignoreFailures": true
                },
                {
                    "description": "Disable thread event printing",
                    "text": "set print thread-events off",
                    "ignoreFailures": true
                }
            ],
            "postRemoteConnectCommands": [
                {
                    "description": "Remove the default `break -f main` inserted by cppdbg (github issue: vscode-cpptools#8011)",
                    "text": "delete 1",
                    "ignoreFailures": true
                },
                {
                    "description": "Load command",
                    "text": "load",
                    "ignoreFailures": true
                }
            ],
            "miDebuggerServerAddress": "localhost:1234",
            "serverLaunchTimeout": 5000,
            "debugServerArgs": "--gdb tcp::1234 --machine virt --nographic -S --bios none -d cpu_reset",
            "debugServerPath": "qemu-system-riscv32.exe",
            "filterStderr": true,
            "hardwareBreakpoints": {
                "require": false,
                "limit": 4
            },
            "symbolLoadInfo": {
                "loadAll": true,
                "exceptionList": ""
            },
            "sourceFileMap": {
                "C:\\workspace_ms\\qemu32_baremetal\\qemu32_baremetal\\src": "c:\\Users\\Ashling\\AppData\\Local\\Ashling\\qemu32_baremetal\\src"
            }
        }
    ]
}

Debugger Logs

Attached in the issue.

Other Extensions

No response

Additional Information

If I map without /src folder, it's working.

Start by reproducing the Windows debugging scenario with the provided launch configuration and its nested sourceFileMap entry. Review the attached engine_debug_log.txt while comparing the working project-root mapping with the failing /src mapping; done means the editor opens the relocated source file when the nested mapping is used.