Use absolute paths for --stdin-filename matching (#1843)

Non-basename glob matches (e.g., for `--per-file-ignores`) assume that
the path has been converted to an absolute path. (We do this for
filenames as part of the directory traversal.) For filenames passed via
stdin, though, we're missing this conversion. So `--per-file-ignores`
that rely on the _basename_ worked as expected, but directory paths did
not.

Closes #1840.

src/main_native.rs

@@ -14,7 +14,7 @@ use ::ruff::settings::types::SerializationFormat;
 use ::ruff::settings::{pyproject, Settings};
 #[cfg(feature = "update-informer")]
 use ::ruff::updates;
-use ::ruff::{commands, fix, warn_user_once};
+use ::ruff::{commands, fix, fs, warn_user_once};
 use anyhow::Result;
 use clap::{CommandFactory, Parser};
 use colored::Colorize;
@@ -244,7 +244,7 @@ pub(crate) fn inner_main() -> Result<ExitCode> {
         // Generate lint violations.
         let diagnostics = if is_stdin {
             commands::run_stdin(
-                cli.stdin_filename.as_deref(),
+                cli.stdin_filename.map(fs::normalize_path).as_deref(),
                 &pyproject_strategy,
                 &file_strategy,
                 &overrides,