Avoid trimming escaped whitespace in D210 (#3635)

crates/ruff/src/rules/pydocstyle/helpers.rs

@@ -62,6 +62,11 @@ pub(crate) fn should_ignore_definition(
     false
 }
 
+/// Return true if a line ends with an odd number of backslashes (i.e., ends with an escape).
+pub(crate) fn ends_with_backslash(line: &str) -> bool {
+    line.chars().rev().take_while(|c| *c == '\\').count() % 2 == 1
+}
+
 /// Check if a docstring should be ignored.
 pub(crate) fn should_ignore_docstring(contents: &str) -> bool {
     // Avoid analyzing docstrings that contain implicit string concatenations.

crates/ruff/src/rules/pydocstyle/rules/no_surrounding_whitespace.rs

@@ -8,6 +8,7 @@ use crate::checkers::ast::Checker;
 use crate::docstrings::definition::Docstring;
 use crate::message::Location;
 use crate::registry::AsRule;
+use crate::rules::pydocstyle::helpers::ends_with_backslash;
 
 #[violation]
 pub struct SurroundingWhitespace;
@@ -46,6 +47,7 @@ pub fn no_surrounding_whitespace(checker: &mut Checker, docstring: &Docstring) {
             // characters, avoid applying the fix.
             if !trimmed.ends_with(pattern.chars().last().unwrap())
                 && !trimmed.starts_with(pattern.chars().last().unwrap())
+                && !ends_with_backslash(trimmed)
             {
                 diagnostic.amend(Fix::replacement(
                     trimmed.to_string(),