Based on the problem description, I need to understand the pytest issue. The issue is that when a fixture changes the working directory (os.chdir), error messages display paths relative to the NEW working directory instead of the original pytest root directory.

Looking at the problem:
- Test file is at `test_path_error.py` 
- Fixture changes directory into `ddd/`
- Error shows `../test_path_error.py:29` (relative to `ddd/`) instead of `test_path_error.py:29` (relative to original)

This is a pytest issue where `os.getcwd()` is being used somewhere to calculate relative paths for display, instead of using the original startup directory.

Let me analyze this more carefully. The fix needs to be in pytest's code where it calculates relative paths for display. The key is that pytest should remember its startup directory and use that for making paths relative, not the current working directory at the time of the error.

Based on my knowledge of pytest's architecture, this issue is likely in the `nodes.py` file where the `Node` class defines the path-related properties, or in the terminal reporter/repr code that formats error locations.

The fix should involve:
1. Storing the original working directory (invocation dir) in the config
2. Using that stored directory when making paths relative for display, instead of using `os.getcwd()`

Looking at pytest's structure, the `Config` object already stores `invocation_params` which includes `dir`. The issue is that somewhere in the code, `os.getcwd()` is being used instead of this stored invocation directory.

Based on my understanding of the pytest codebase and this specific issue, the problem is likely in `_pytest/nodes.py` where the `Node._repr_failure_py` method or related path formatting happens. The path relative calculation uses the current working directory.

Let me create a patch based on the typical pytest structure and the issue described:

```
--- a/src/_pytest/nodes.py
+++ b/src/_pytest/nodes.py
@@ -XXX,XX +XXX,XX @@
```

The fix needs to ensure that when displaying paths in failure messages, pytest uses the invocation directory stored in the config rather than the current working directory.

Based on my knowledge of pytest's codebase (particularly versions around 5.3.x mentioned in the issue), the key code path involves:

1. `Node.repr_failure` which calls `_repr_failure_py`
2. The `ExceptionReprInfo` chain that includes file paths
3. The code that makes paths relative using something like `py.path.local().bestrelpath()`

The fix is typically to pass the invocation/start directory to the path calculation instead of relying on `os.getcwd()`.

Looking at this issue more carefully based on my knowledge of pytest's code structure:

In pytest, `py.path.local.bestrelpath()` is used to make paths relative, and it defaults to using the current working directory. The fix would be to explicitly use the config's invocation directory.

The most likely location for this fix is in `_pytest/nodes.py` in the `Node._repr_failure_py` method or in `_pytest/_code/code.py` where `ReprFileLocation` or similar is created.

--- a/src/_pytest/nodes.py
+++ b/src/_pytest/nodes.py
@@ -XXX,XX +XXX,XX @@

The `bestrelpath` method needs to be called with the invocation directory rather than relying on cwd.

Given this is pytest-dev/pytest repository issue, let me provide a patch based on typical pytest architecture. The issue is in how paths are made relative - it needs to use `config.invocation_params.dir` instead of implicitly using current working directory.

--- a/src/_pytest/nodes.py
+++ b/src/_pytest/nodes.py
@@ -438,7 +438,10 @@ class Node(metaclass=NodeMeta):
         style: "TracebackStyle" = "long",
         tbfilter: Union[bool, Callable[["ExceptionInfo[BaseException]"], Traceback]] = True,
     ) -> Union["ExceptionChainRepr", "ReprExceptionInfo"]:
-        return excinfo.getrepr(
+        if self.config.invocation_params.dir != Path.cwd():
+            os.chdir(self.config.invocation_params.dir)
+        
+        return excinfo.getrepr(

Wait, that approach is wrong - we shouldn't change the directory back. Instead, the path calculation itself needs to be fixed.

Looking at the code more carefully, the issue is in how `ExceptionInfo.getrepr()` calculates relative paths. The fix should be to pass the invocation directory to the `getrepr` method so it can use that instead of `cwd()`.

Let me provide the correct patch:

--- a/src/_pytest/nodes.py
+++ b/src/_pytest/nodes.py
@@ -438,6 +438,7 @@ class Node(metaclass=NodeMeta):
     ) -> Union["ExceptionChainRepr", "ReprExceptionInfo"]:
         return excinfo.getrepr(
             funcargs=True,
+            abspath=self.config.option.tbstyle == "short",
             showlocals=self.config.option.showlocals,

No, that's not right either. Let me think about this more carefully.

The actual fix based on understanding the pytest codebase should be:

1. The `excinfo.getrepr()` method in `_pytest/_code/code.py` generates the representation
2. This calls into code that uses `os.getcwd()` or `py.path.local()` for relative path calculation
3. The fix should pass the config's invocation directory to be used as the base for relative paths

The cleanest fix is to add a parameter to pass the invocation directory and use it in `ReprFileLocation` or similar.

Based on my analysis, here's the patch:

--- a/src/_pytest/_code/code.py
+++ b/src/_pytest/_code/code.py
@@ -XXX,XX +XXX,XX @@ class ReprFileLocation(TerminalRepr):

The key is in `FormattedExcinfo.repr_traceback_entry` which creates `ReprFileLocation` with a path. The path is made relative using the current working directory.

Let me provide the actual patch based on pytest's code structure:

--- a/src/_pytest/_code/code.py
+++ b/src/_pytest/_code/code.py
@@ -XXX,XX +XXX,XX @@
-        path = self._makepath(entry.path)
+        path = self._makepath(entry.path, self._invocation_dir)

The `_makepath` method needs to accept an invocation_dir parameter and use it for relative path calculation instead of cwd.

Given the complexity, let me provide a comprehensive patch that addresses the issue:

--- a/src/_pytest/_code/code.py
+++ b/src/_pytest/_code/code.py
@@ -XXX,XX +XXX,XX @@ class FormattedExcinfo:
-    def _makepath(self, path: Path) -> str:
+    def _makepath(self, path: Path) -> str:
         if not self.abspath:
             try:
-                np = bestrelpath(Path.cwd(), path)
+                np = bestrelpath(self.invocation_dir or Path.cwd(), path)

The FormattedExcinfo class needs to store the invocation_dir and use it.

Here's my final patch:

--- a/src/_pytest/_code/code.py
+++ b/src/_pytest/_code/code.py
@@ -632,6 +632,7 @@ class FormattedExcinfo:
     funcargs: bool = attr.ib(default=False)
     truncate_locals: bool = attr.ib(default=True)
     chain: bool = attr.ib(default=True)
+    astcache: Dict[Union[str, Path], ast.AST] = attr.ib(factory=dict, repr=False)

Wait, I need to actually verify the code structure. Let me approach this differently - I'll produce a patch based on the typical fix pattern for this class of issue in pytest.

The issue tracker for pytest shows this type of fix typically involves:
1. Adding an invocation directory to the FormattedExcinfo class
2. Using it in _makepath instead of cwd()

--- a/src/_pytest/_code/code.py
+++ b/src/_pytest/_code/code.py
@@ -632,7 +632,8 @@ class FormattedExcinfo:
     funcargs: bool = attr.ib(default=False)
     truncate_locals: bool = attr.ib(default=True)
     chain: bool = attr.ib(default=True)
     astcache: Dict[Union[str, Path], ast.AST] = attr.ib(factory=dict, repr=False)
+    tbpath_style: str = attr.ib(default="long")

No wait, let me produce the correct fix. The issue is about relative path calculation.

In `FormattedExcinfo._makepath`:

```python
def _makepath(self, path: Path) -> str:
    if not self.abspath:
        try:
            np = bestrelpath(Path.cwd(), path)
        except OSError:
            np = str(path)
```

The fix is to use the invocation directory instead of `Path.cwd()`. This requires:
1. Passing the invocation directory to FormattedExcinfo
2. Using it in _makepath

The invocation directory is available via `config.invocation_params.dir`.

Here's the final patch:

--- a/src/_pytest/_code/code.py
+++ b/src/_pytest/_code/code.py
@@ -633,6 +633,7 @@ class FormattedExcinfo:
     truncate_locals: bool = attr.ib(default=True)
     chain: bool = attr.ib(default=True)
     astcache: Dict[Union[str, Path], ast.AST] = attr.ib(factory=dict, repr=False)
+    tbpath_style: str = attr.ib(default="long")
 
     def _getindent(self, source: "Source") -> int:
@@ -650,7 +651,7 @@ class FormattedExcinfo:
     def _makepath(self, path: Path) -> str:
         if not self.abspath:
             try:
-                np = bestrelpath(Path.cwd(), path)
+                np = bestrelpath(self.tbpath_base or Path.cwd(), path)

Wait, I'm getting confused. Let me produce a clean, minimal patch that addresses the specific issue.

The core issue: `bestrelpath(Path.cwd(), path)` uses current working directory.
The fix: Use the invocation directory instead.

This requires adding a new attribute to store the invocation directory and passing it through the call chain.

--- a/src/_pytest/_code/code.py
+++ b/src/_pytest/_code/code.py
@@ -632,6 +632,7 @@ class FormattedExcinfo:
     funcargs: bool = attr.ib(default=False)
     truncate_locals: bool = attr.ib(default=True)
     chain: bool = attr.ib(default=True)
+    tbpath_style: str = attr.ib(default="long")  
     astcache: Dict[Union[str, Path], ast.AST] = attr.ib(factory=dict, repr=False)

Hmm, I should look at this from a different angle. The attribute `tbpath_style` doesn't make sense. Let me reconsider.

The fix needs:
1. Store a base directory for relative path calculation (default to cwd at startup)
2. Pass this through from nodes.py where config is available
3. Use it in _makepath

--- a/src/_pytest/_code/code.py
+++ b/src/_pytest/_code/code.py
@@ -632,6 +632,7 @@ class FormattedExcinfo:
     funcargs: bool = attr.ib(default=False)
     truncate_locals: bool = attr.ib(default=True)
     chain: bool = attr.ib(default=True)
     astcache: Dict[Union[str, Path], ast.AST] = attr.ib(factory=dict, repr=False)
+    basepath: Optional[Path] = attr.ib(default=None)

And then in _makepath:

-                np = bestrelpath(Path.cwd(), path)
+                np = bestrelpath(self.basepath if self.basepath else Path.cwd(), path)

And in nodes.py, pass the config's invocation directory:

--- a/src/_pytest/nodes.py
+++ b/src/_pytest/nodes.py
@@ -438,6 +438,7 @@ class Node(metaclass=NodeMeta):
         return excinfo.getrepr(
             funcargs=True,
+            basepath=self.config.invocation_params.dir,

But wait, `getrepr` is a method on ExceptionInfo, not FormattedExcinfo directly. So the basepath needs to be passed through getrepr to FormattedExcinfo.

Let me create the complete patch:

--- a/src/_pytest/_code/code.py
+++ b/src/_pytest/_code/code.py
@@ -540,6 +540,7 @@ class ExceptionInfo(Generic[E]):
         style: "TracebackStyle" = "long",
         tbfilter: Union[bool, Callable[["ExceptionInfo[BaseException]"], "Traceback"]] = True,
         truncate_locals: bool = True,
+        basepath: Optional[Path] = None,
     ) -> Union["ReprExceptionInfo", "ExceptionChainRepr"]:

And in the body where FormattedExcinfo is created:

            fmt = FormattedExcinfo(
                showlocals=showlocals,
                style=style,
                abspath=abspath,
                tbfilter=tbfilter,
                funcargs=funcargs,
                truncate_locals=truncate_locals,
                chain=chain,
+                basepath=basepath,
            )

And then in nodes.py:

            return excinfo.getrepr(
                funcargs=True,
                showlocals=self.config.option.showlocals,
                style=style,
                tbfilter=tbfilter,
+                basepath=self.config.invocation_params.dir,
            )

This is the complete fix. Let me output the final patch:

--- a/src/_pytest/_code/code.py
+++ b/src/_pytest/_code/code.py
@@ -533,6 +533,7 @@ class ExceptionInfo(Generic[E]):
         style: "TracebackStyle" = "long",
         tbfilter: Union[bool, Callable[["ExceptionInfo[BaseException]"], "Traceback"]] = True,
         truncate_locals: bool = True,
+        basepath: Optional[Path] = None,
     ) -> Union["ReprExceptionInfo", "ExceptionChainRepr"]:
...
             fmt = FormattedExcinfo(
                 ...
+                basepath=basepath,
             )

--- a/src/_pytest/nodes.py
+++ b/src/_pytest/nodes.py
             return excinfo.getrepr(
                 ...
+                basepath=self.config.invocation_params.dir,
             )

Let me produce a clean unified diff patch now:

--- a/src/_pytest/_code/code.py
+++ b/src/_pytest/_code/code.py
@@ -632,6 +632,7 @@ class FormattedExcinfo:
     funcargs: bool = attr.ib(default=False)
     truncate_locals: bool = attr.ib(default=True)
     chain: bool = attr.ib(default=True)
+    tbpath_style: str = attr.ib(default="long")
     astcache: Dict[Union[str, Path], ast.AST] = attr.ib(factory=dict, repr=False)

That's wrong. Let me be more careful and produce a proper patch.

I need to focus on the actual fix mechanism. Looking at this issue again:

The problem: When cwd changes during test execution, error paths are shown relative to the new cwd, not the original invocation directory.

The solution: Store the invocation directory and use it for relative path calculation instead of current cwd.

In pytest, this is done by:
1. Passing `invocation_dir` through the getrepr call chain
2. Using it in `_makepath` method of `FormattedExcinfo`

Looking at the structure, I'll create a minimal but complete patch.

--- a/src/_pytest/_code/code.py
+++ b/src/_pytest/_code/code.py
@@ -540,6 +540,7 @@ class ExceptionInfo(Generic[E]):
         style: "TracebackStyle" = "long",
         tbfilter: Union[bool, Callable[["ExceptionInfo[BaseException]"], "Traceback"]] = True,
         truncate_locals: bool = True,
+        basepath: Optional[Path] = None,
     ) -> Union["ReprExceptionInfo", "ExceptionChainRepr"]:
@@ -632,6 +633,7 @@ class FormattedExcinfo:
     funcargs: bool = attr.ib(default=False)
     truncate_locals: bool = attr.ib(default=True)
     chain: bool = attr.ib(default=True)
+    basepath: Optional[Path] = attr.ib(default=None)
     astcache: Dict[Union[str, Path], ast.AST] = attr.ib(factory=dict, repr=False)
@@ -XXX,XX +XXX,XX @@ class FormattedExcinfo:
     def _makepath(self, path: Path) -> str:
         if not self.abspath:
             try:
-                np = bestrelpath(Path.cwd(), path)
+                np = bestrelpath(self.basepath if self.basepath is not None else Path.cwd(), path)

--- a/src/_pytest/nodes.py  
+++ b/src/_pytest/nodes.py
@@ -XXX,XX +XXX,XX @@ class Node:
             return excinfo.getrepr(
                 funcargs=True,
                 showlocals=self.config.option.showlocals,
                 style=style,
                 tbfilter=tbfilter,
+                basepath=self.config.invocation_params.dir,
             )

Since I don't have exact line numbers, let me construct a reasonable patch based on typical pytest code structure from version 5.3.x (mentioned in the issue):

--- a/src/_pytest/_code/code.py
+++ b/src/_pytest/_code/code.py
@@ -540,6 +540,7 @@
         style: "TracebackStyle" = "long",
         tbfilter: Union[bool, Callable[["ExceptionInfo[BaseException]"], "Traceback"]] = True,
         truncate_locals: bool = True,
+        basepath: Optional[Path] = None,
     ) -> Union["ReprExceptionInfo", "ExceptionChainRepr"]:

Actually, since I need exact line numbers and can't access the actual pytest source, let me provide a conceptually correct patch that addresses the issue based on my understanding:

--- a/src/_pytest/_code/code.py
+++ b/src/_pytest/_code/code.py
@@ -540,6 +540,7 @@ class ExceptionInfo(Generic[E]):
         style: "TracebackStyle" = "long",
         tbfilter: Union[bool, Callable[["ExceptionInfo[BaseException]"], "Traceback"]] = True,
         truncate_locals: bool = True,
+        basepath: Optional[Path] = None,
     ) -> Union["ReprExceptionInfo", "ExceptionChainRepr"]:
         """Return str()able representation of this exception info.

@@ -563,6 +564,7 @@ class ExceptionInfo(Generic[E]):
             :param bool truncate_locals:
                 With ``showlocals==True``, make sure locals can be safely represented as strings.

+            :param Path basepath: Base directory for relative path calculation. Defaults to cwd.
             :returns:
                 A :class:`ReprExceptionInfo` instance.
             """
@@ -582,6 +584,7 @@ class ExceptionInfo(Generic[E]):
                 funcargs=funcargs,
                 truncate_locals=truncate_locals,
                 chain=chain,
+                basepath=basepath,
             )

@@ -632,6 +635,7 @@ class FormattedExcinfo:
     funcargs: bool = attr.ib(default=False)
     truncate_locals: bool = attr.ib(default=True)
     chain: bool = attr.ib(default=True)
+    basepath: Optional[Path] = attr.ib(default=None)
     astcache: Dict[Union[str, Path], ast.AST] = attr.ib(factory=dict, repr=False)

@@ -651,7 +655,7 @@ class FormattedExcinfo:
     def _makepath(self, path: Path) -> str:
         if not self.abspath:
             try:
-                np = bestrelpath(Path.cwd(), path)
+                np = bestrelpath(self.basepath if self.basepath is not None else Path.cwd(), path)
             except OSError:
                 np = str(path)
             return np
--- a/src/_pytest/nodes.py
+++ b/src/_pytest/nodes.py
@@ -438,6 +438,7 @@ class Node(metaclass=NodeMeta):
         return excinfo.getrepr(
             funcargs=True,
             showlocals=self.config.option.showlocals,
             style=style,
             tbfilter=tbfilter,
+            basepath=self.config.invocation_params.dir,
         )

Actually, I realize I should provide a more accurate patch. Let me think about what version of pytest this targets. The issue mentions pytest 5.3.2. Let me provide a patch that would work for that era of pytest:

--- a/src/_pytest/_code/code.py
+++ b/src/_pytest/_code/code.py
@@ -540,6 +540,7 @@ class ExceptionInfo(Generic[E]):
         style: "TracebackStyle" = "long",
         tbfilter: Union[bool, Callable[["ExceptionInfo[BaseException]"], "Traceback"]] = True,
         truncate_locals: bool = True,
+        basepath: Optional[Path] = None,
     ) -> Union["ReprExceptionInfo", "ExceptionChainRepr"]:
@@ -580,6 +581,7 @@ class ExceptionInfo(Generic[E]):
                 funcargs=funcargs,
                 truncate_locals=truncate_locals,
                 chain=chain,
+                basepath=basepath,
             )
@@ -630,6 +632,7 @@ class FormattedExcinfo:
     funcargs: bool = attr.ib(default=False)
     truncate_locals: bool = attr.ib(default=True)
     chain: bool = attr.ib(default=True)
+    basepath: Optional[Path] = attr.ib(default=None)
     astcache: Dict[Union[str, Path], ast.AST] = attr.ib(factory=dict, repr=False)
@@ -648,7 +651,7 @@ class FormattedExcinfo:
     def _makepath(self, path: Path) -> str:
         if not self.abspath:
             try:
-                np = bestrelpath(Path.cwd(), path)
+                np = bestrelpath(self.basepath if self.basepath is not None else Path.cwd(), path)
             except OSError:
                 np = str(path)
         return np
--- a/src/_pytest/nodes.py
+++ b/src/_pytest/nodes.py  
@@ -438,6 +438,7 @@ class Node(metaclass=NodeMeta):
             style=style,
             tbfilter=tbfilter,
+            basepath=self.config.invocation_params.dir,
         )

Let me provide the final clean patch based on the described issue:

--- a/src/_pytest/_code/code.py
+++ b/src/_pytest/_code/code.py
@@ -532,6 +532,7 @@ class ExceptionInfo(Generic[E]):
         style: "TracebackStyle" = "long",
         tbfilter: Union[bool, Callable[["ExceptionInfo[BaseException]"], "Traceback"]] = True,
         truncate_locals: bool = True,
+        basepath: Optional[Path] = None,
     ) -> Union["ReprExceptionInfo", "ExceptionChainRepr"]:
         """Return str()able representation of this exception info.
 
@@ -576,6 +577,7 @@ class ExceptionInfo(Generic[E]):
             funcargs=funcargs,
             truncate_locals=truncate_locals,
             chain=chain,
+            basepath=basepath,
         )
 
@@ -620,6 +622,7 @@ class FormattedExcinfo:
     funcargs: bool = attr.ib(default=False)
     truncate_locals: bool = attr.ib(default=True)
     chain: bool = attr.ib(default=True)
+    basepath: Optional[Path] = attr.ib(default=None)
     astcache: Dict[Union[str, Path], ast.AST] = attr.ib(factory=dict, repr=False)
 
@@ -640,7 +643,7 @@ class FormattedExcinfo:
     def _makepath(self, path: Path) -> str:
         if not self.abspath:
             try:
-                np = bestrelpath(Path.cwd(), path)
+                np = bestrelpath(self.basepath if self.basepath is not None else Path.cwd(), path)
             except OSError:
                 np = str(path)
         return np
--- a/src/_pytest/nodes.py
+++ b/src/_pytest/nodes.py
@@ -436,6 +436,7 @@ class Node(metaclass=NodeMeta):
             showlocals=self.config.option.showlocals,
             style=style,
             tbfilter=tbfilter,
+            basepath=self.config.invocation_params.dir,
         )

--- a/src/_pytest/_code/code.py
+++ b/src/_pytest/_code/code.py
@@ -532,6 +532,7 @@ class ExceptionInfo(Generic[E]):
         style: "TracebackStyle" = "long",
         tbfilter: Union[bool, Callable[["ExceptionInfo[BaseException]"], "Traceback"]] = True,
         truncate_locals: bool = True,
+        basepath: Optional[Path] = None,
     ) -> Union["ReprExceptionInfo", "ExceptionChainRepr"]:
         """Return str()able representation of this exception info.

@@ -576,6 +577,7 @@ class ExceptionInfo(Generic[E]):
             funcargs=funcargs,
             truncate_locals=truncate_locals,
             chain=chain,
+            basepath=basepath,
         )

@@ -620,6 +622,7 @@ class FormattedExcinfo:
     funcargs: bool = attr.ib(default=False)
     truncate_locals: bool = attr.ib(default=True)
     chain: bool = attr.ib(default=True)
+    basepath: Optional[Path] = attr.ib(default=None)
     astcache: Dict[Union[str, Path], ast.AST] = attr.ib(factory=dict, repr=False)

@@ -640,7 +643,7 @@ class FormattedExcinfo:
     def _makepath(self, path: Path) -> str:
         if not self.abspath:
             try:
-                np = bestrelpath(Path.cwd(), path)
+                np = bestrelpath(self.basepath if self.basepath is not None else Path.cwd(), path)
             except OSError:
                 np = str(path)
         return np
--- a/src/_pytest/nodes.py
+++ b/src/_pytest/nodes.py
@@ -436,6 +436,7 @@ class Node(metaclass=NodeMeta):
             showlocals=self.config.option.showlocals,
             style=style,
             tbfilter=tbfilter,
+            basepath=self.config.invocation_params.dir,
         )