[clang] [libclang/python] Fix bug in `SourceRange.__contains__`, add tests (PR #101802)

[Aaron Ballman via cfe-commits]

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@@ -74,6 +74,16 @@ CINDEX_LINKAGE CXSourceLocation clang_getNullLocation(void);
 CINDEX_LINKAGE unsigned clang_equalLocations(CXSourceLocation loc1,
                                              CXSourceLocation loc2);
 
+/**
+ * Determine for two source locations if they refer to the same file
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AaronBallman wrote:

Documentation needs to be updated.

https://github.com/llvm/llvm-project/pull/101802