refactor: scrub file names in expect_snapshot_igraph_error()

[Copilot]

Enhanced expect_snapshot_igraph_error() to scrub file paths from error messages in test snapshots, making them independent of build directory structure and more stable across environments.

Changes

• Updated transform function: Now scrubs both file names and line numbers from error messages using two patterns:
  • Source: filename:linenumber → Source: <file>:<line>
  • At path/to/file:line : → At <file>:<line> :
• Updated snapshots: Regenerated all affected test snapshots (52 error messages across aaa-auto.md and centrality.md) to use the new format

The regex handles legacy placeholders (xx, <linenumber>) for compatibility with tests using custom transforms.

Example

Before:

Error in `arpack()`:
! ARPACK error. N must be positive
Source: linalg/arpack.c:42

After:

Error in `arpack()`:
! ARPACK error. N must be positive
Source: <file>:<line>

• By submitting this pull request, I assign the copyright of my contribution to The igraph development team.

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[Copilot]

Pull request overview

This PR enhances the expect_snapshot_igraph_error() test helper function to scrub file paths and line numbers from error messages in test snapshots, making them independent of build directory structures and more stable across different environments.

Changes:

• Updated the transform function in expect_snapshot_igraph_error() to replace file paths and line numbers with placeholders <file> and <line>
• Regenerated 52 error message snapshots across test files to use the new sanitized format
• Added tests/testthat/_problems/ to .gitignore to exclude testthat's problem report directory

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 1 comment.

File	Description
tests/testthat/helper.R	Enhanced transform function with two regex patterns to scrub "Source:" and "At" file path patterns, with backward compatibility for legacy placeholders
tests/testthat/_snaps/centrality.md	Updated 1 error snapshot to use <file>:<line> placeholders
tests/testthat/_snaps/aaa-auto.md	Updated 51 error snapshots to use <file>:<line> placeholders
.gitignore	Added testthat problem reports directory to exclusions

[Copilot]

The regex pattern for the "At" pattern on line 55 only includes xx as a legacy placeholder but not <linenumber>, while the "Source" pattern on line 54 includes both xx and <linenumber>. For consistency and to handle all cases mentioned in the PR description, consider updating the pattern to: "At [^:]+:(\\d+|xx|<linenumber>) :". This ensures both patterns handle the same set of legacy placeholders.

Suggested change

	y <- gsub("At [^:]+:(\\d+|xx) :", "At <file>:<line> :", y)
	y <- gsub("At [^:]+:(\\d+|xx|<linenumber>) :", "At <file>:<line> :", y)