Autogenerated Python Code from GRC does not work for File Meta Source when trying to change filename

[nuena]

What happened?

When using File Meta Source with a parameter, runtime-adjusting the file name does not work with the automatically generated Python code, at least if detatched header = False. I'm pretty sure it also won't work with detached_header = True, but I didn't test it.

The automatically generated Python code is invalid and will cause an exception/error when used.

    def set_file(self, file):
        self.file = file
        self.blocks_file_meta_source_0.open(self.file, True)

For the file source block, the auto-generated code works as expected.

System Information

OS: Ubuntu 20.04 LTS (x86-64)
GR Installation Method: radioconda

GNU Radio Version

3.10 (maint-3.10)

Specific Version

3.10.9.2

Steps to Reproduce the Problem

1. Create a GRC flowgraph with a File Meta Source (connected to a Null sink) and a Parameter block with the parameter name "file". Use this parameter as file name. Other parameter names are acceptable of course, but will change the name of the set-method created
2. instantiate Top Block from Python and call set_file(<...>) after instantiation.

>>> from crash import crash
>>> tb = crash(filename = "test.bin")
>>> tb.set_filename("/dev/zero")         # <--- the file name you speficy here does not matter, the error will always occur. 

Relevant log output

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/<username>/tests/crash_python/crash.py", line 59, in set_file
    self.blocks_file_meta_source_0.open(self.file, True)
TypeError: open(): incompatible function arguments. The following argument types are supported:
    1. (self: gnuradio.blocks.blocks_python.file_meta_source, filename: str, hdr_filename: str = '') -> bool

Invoked with: <gnuradio.blocks.blocks_python.file_meta_source object at 0x7f73f30be970>, '/dev/zero', True