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

[Jannick Kremer via cfe-commits]

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@@ -269,6 +269,14 @@ def _get_instantiation(self):
                 f = None
             self._data = (f, int(l.value), int(c.value), int(o.value))
         return self._data
+    
+    def __le__(self, other):
+        if self.line < other.line:
+            return True
+        if self.line == other.line and self.column <= other.column:
+            return True
+        # when self.line > other.line
+        return False
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DeinAlptraum wrote:

Note that this does not at all look at the location's file currently.
Imo returning `False` when `self.file != other.file` would be reasonable, but we can't do that if we want to use this in `SourceRange.__contains__`: that function allows this for half-open intervals, where `end.file` is `None`.
This is also consistent with the C interface's `SourceLocation::operator<=`: that also only takes into account the line and column number

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