Fix file rename check running on files that aren't part of the workspace

[DetachHead]

fixes #826

[github-actions]

Diff from mypy_primer, showing the effect of this PR on open source code:

sympy (https://github.com/sympy/sympy)
-     Type of "term1" is "tuple[Unknown, ...] | Unknown | Product | Basic | Order | Any | Equality | Relational | Unequality" (reportUnknownVariableType)
+     Type of "term1" is "tuple[Unknown, ...] | Unknown | Product | Basic | Equality | Order | Relational | Unequality | Any" (reportUnknownVariableType)
-     Type of "doit" is "((**hints: Unknown) -> Equality) | Unknown | ((**hints: Unknown) -> Relational) | ((**hints: Unknown) -> Unequality) | ((**hints: Unknown) -> (tuple[Unknown, ...] | Unknown | Product | Basic | Order | Any))" (reportUnknownMemberType)
+     Type of "doit" is "((**hints: Unknown) -> Equality) | Unknown | ((**hints: Unknown) -> Relational) | ((**hints: Unknown) -> Unequality) | ((**hints: Unknown) -> (tuple[Unknown, ...] | Unknown | Product | Basic | Equality | Order | Relational | Unequality | Any))" (reportUnknownMemberType)
-     Type of "term2" is "tuple[Unknown, ...] | Unknown | Product | Basic | Order | Any | Equality | Relational | Unequality" (reportUnknownVariableType)
+     Type of "term2" is "tuple[Unknown, ...] | Unknown | Product | Basic | Equality | Order | Relational | Unequality | Any" (reportUnknownVariableType)
-     Type of "doit" is "((**hints: Unknown) -> Equality) | Unknown | ((**hints: Unknown) -> Relational) | ((**hints: Unknown) -> Unequality) | ((**hints: Unknown) -> (tuple[Unknown, ...] | Unknown | Product | Basic | Order | Any))" (reportUnknownMemberType)
+     Type of "doit" is "((**hints: Unknown) -> Equality) | Unknown | ((**hints: Unknown) -> Relational) | ((**hints: Unknown) -> Unequality) | ((**hints: Unknown) -> (tuple[Unknown, ...] | Unknown | Product | Basic | Equality | Order | Relational | Unequality | Any))" (reportUnknownMemberType)
-     Type of "f" is "tuple[Unknown, ...] | Unknown | Product | Basic | Order | Any | Equality | Relational | Unequality" (reportUnknownVariableType)
+     Type of "f" is "tuple[Unknown, ...] | Unknown | Product | Basic | Equality | Order | Relational | Unequality | Any" (reportUnknownVariableType)
-     Type of "doit" is "((**hints: Unknown) -> Equality) | Unknown | ((**hints: Unknown) -> Relational) | ((**hints: Unknown) -> Unequality) | ((**hints: Unknown) -> (tuple[Unknown, ...] | Unknown | Product | Basic | Order | Any))" (reportUnknownMemberType)
+     Type of "doit" is "((**hints: Unknown) -> Equality) | Unknown | ((**hints: Unknown) -> Relational) | ((**hints: Unknown) -> Unequality) | ((**hints: Unknown) -> (tuple[Unknown, ...] | Unknown | Product | Basic | Equality | Order | Relational | Unequality | Any))" (reportUnknownMemberType)
-     Type of "doit" is "((**hints: Unknown) -> Equality) | Unknown | ((**hints: Unknown) -> Relational) | ((**hints: Unknown) -> Unequality) | ((**hints: Unknown) -> (tuple[Unknown, ...] | Unknown | Product | Basic | Order | Any))" (reportUnknownMemberType)
+     Type of "doit" is "((**hints: Unknown) -> Equality) | Unknown | ((**hints: Unknown) -> Relational) | ((**hints: Unknown) -> Unequality) | ((**hints: Unknown) -> (tuple[Unknown, ...] | Unknown | Product | Basic | Equality | Order | Relational | Unequality | Any))" (reportUnknownMemberType)
+   /tmp/mypy_primer/projects/sympy/sympy/stats/rv.py:473:26 - warning: Type of "probability" is partially unknown
+     Type of "probability" is "(condition: Unknown, **kwargs: Unknown) -> (Unknown | Order | Lambda | Probability | Self@Expr | tuple[Unknown, ...] | Sum | Any | Piecewise | Basic | Equality | Relational | Unequality | int)" (reportUnknownMemberType)
-   /tmp/mypy_primer/projects/sympy/sympy/stats/rv.py:983:16 - warning: Return type is unknown (reportUnknownVariableType)
+   /tmp/mypy_primer/projects/sympy/sympy/stats/rv.py:983:16 - warning: Return type, "Unknown | Lambda | Any | dict[Unknown, Unknown]", is partially unknown (reportUnknownVariableType)
-   /tmp/mypy_primer/projects/sympy/sympy/stats/rv.py:1018:16 - warning: Return type is unknown (reportUnknownVariableType)
+   /tmp/mypy_primer/projects/sympy/sympy/stats/rv.py:1018:16 - warning: Return type, "Unknown | Lambda | Any", is partially unknown (reportUnknownVariableType)
-   /tmp/mypy_primer/projects/sympy/sympy/stats/rv.py:1029:16 - warning: Return type is unknown (reportUnknownVariableType)
+   /tmp/mypy_primer/projects/sympy/sympy/stats/rv.py:1029:16 - warning: Return type, "Unknown | Lambda | Any", is partially unknown (reportUnknownVariableType)
-   /tmp/mypy_primer/projects/sympy/sympy/stats/rv.py:1063:16 - warning: Return type is unknown (reportUnknownVariableType)
+   /tmp/mypy_primer/projects/sympy/sympy/stats/rv.py:1063:16 - warning: Return type, "Unknown | ConditionalFiniteDomain | Any", is partially unknown (reportUnknownVariableType)
-   /tmp/mypy_primer/projects/sympy/sympy/stats/stochastic_process_types.py:527:13 - warning: Type of "condition" is partially unknown
-     Type of "condition" is "Relational | Equality | Unequality | Unknown" (reportUnknownVariableType)
-     Type of "condition" is "_NotImplementedType | Unknown" (reportUnknownVariableType)
+     Type of "condition" is "_NotImplementedType | StrictLessThan | Unknown | Equality | Relational | Unequality" (reportUnknownVariableType)
-     Type of "condition" is "_NotImplementedType | Unknown" (reportUnknownVariableType)
+     Type of "condition" is "_NotImplementedType | StrictGreaterThan | Unknown | Equality | Relational | Unequality" (reportUnknownVariableType)
-     Type of "condition" is "_NotImplementedType | Unknown" (reportUnknownVariableType)
+     Type of "condition" is "_NotImplementedType | LessThan | Unknown | Equality | Relational | Unequality" (reportUnknownVariableType)
-     Type of "condition" is "_NotImplementedType | Unknown" (reportUnknownVariableType)
+     Type of "condition" is "_NotImplementedType | GreaterThan | Unknown | Equality | Relational | Unequality" (reportUnknownVariableType)
+   /tmp/mypy_primer/projects/sympy/sympy/stats/symbolic_multivariate_probability.py:178:31 - warning: Type of "expand" is partially unknown
+     Type of "expand" is "((**hints: Unknown) -> (ZeroMatrix | VarianceMatrix | Unknown | Expr)) | ((**hints: Unknown) -> (Unknown | Variance | Expr))" (reportUnknownMemberType)
-     Type of "expand" is "((**hints: Unknown) -> Unknown) | ((**hints: Unknown) -> (Unknown | CrossCovarianceMatrix | Covariance | Add))" (reportUnknownMemberType)
+     Type of "expand" is "((**hints: Unknown) -> (Unknown | ZeroMatrix | CrossCovarianceMatrix | Add)) | ((**hints: Unknown) -> (Unknown | CrossCovarianceMatrix | Covariance | Add))" (reportUnknownMemberType)
-   /tmp/mypy_primer/projects/sympy/sympy/stats/symbolic_multivariate_probability.py:259:9 - warning: Return type, "ZeroMatrix | VarianceMatrix | Unknown | Expr | CrossCovarianceMatrix | Add", is partially unknown (reportUnknownParameterType)
+   /tmp/mypy_primer/projects/sympy/sympy/stats/symbolic_multivariate_probability.py:259:9 - warning: Return type, "Unknown | ZeroMatrix | CrossCovarianceMatrix | Add", is partially unknown (reportUnknownParameterType)
-     Type of "expand" is "(**hints: Unknown) -> (ZeroMatrix | VarianceMatrix | Unknown | Expr)" (reportUnknownMemberType)
+     Type of "expand" is "(**hints: Unknown) -> Unknown" (reportUnknownMemberType)
-   /tmp/mypy_primer/projects/sympy/sympy/stats/symbolic_multivariate_probability.py:265:20 - warning: Return type, "ZeroMatrix | VarianceMatrix | Unknown | Expr", is partially unknown (reportUnknownVariableType)
+   /tmp/mypy_primer/projects/sympy/sympy/stats/symbolic_multivariate_probability.py:265:20 - warning: Return type is unknown (reportUnknownVariableType)
-     Type of "expand" is "Unknown | ((deep: bool = True, modulus: Unknown | None = None, power_base: bool = True, power_exp: bool = True, mul: bool = True, log: bool = True, multinomial: bool = True, basic: bool = True, **hints: Unknown) -> (Unknown | Order | Any | RandomSymbol))" (reportUnknownMemberType)
+     Type of "expand" is "Unknown | ((deep: bool = True, modulus: Unknown | None = None, power_base: bool = True, power_exp: bool = True, mul: bool = True, log: bool = True, multinomial: bool = True, basic: bool = True, **hints: Unknown) -> (Unknown | Order | Any | Self@Expr))" (reportUnknownMemberType)
-     Type of "expand" is "((**hints: Unknown) -> Unknown) | ((**hints: Unknown) -> (Unknown | CrossCovarianceMatrix | Covariance | Add))" (reportUnknownMemberType)
+     Type of "expand" is "((**hints: Unknown) -> (Unknown | ZeroMatrix | CrossCovarianceMatrix | Add)) | ((**hints: Unknown) -> (Unknown | CrossCovarianceMatrix | Covariance | Add))" (reportUnknownMemberType)
-     Type of "expand" is "Unknown | ((deep: bool = True, modulus: Unknown | None = None, power_base: bool = True, power_exp: bool = True, mul: bool = True, log: bool = True, multinomial: bool = True, basic: bool = True, **hints: Unknown) -> (Unknown | Order | Any | RandomSymbol))" (reportUnknownMemberType)
+     Type of "expand" is "Unknown | ((deep: bool = True, modulus: Unknown | None = None, power_base: bool = True, power_exp: bool = True, mul: bool = True, log: bool = True, multinomial: bool = True, basic: bool = True, **hints: Unknown) -> (Unknown | Order | Any | Self@Expr))" (reportUnknownMemberType)
-     Type of "expand" is "((**hints: Unknown) -> (ZeroMatrix | VarianceMatrix | Unknown | Expr)) | ((**hints: Unknown) -> (Unknown | Variance | Expr)) | Unknown | Any | ((deep: bool = True, modulus: Unknown | None = None, power_base: bool = True, power_exp: bool = True, mul: bool = True, log: bool = True, multinomial: bool = True, basic: bool = True, **hints: Unknown) -> (Unknown | Order | Any | CentralMoment))" (reportUnknownMemberType)

... (truncated 1334 lines) ...

black (https://github.com/psf/black): 3.66x slower (4.5s -> 16.3s in a single noisy sample)

AutoSplit (https://github.com/Toufool/AutoSplit): 619.93x slower (0.0s -> 16.8s in a single noisy sample)