no longer strip whitespace at the end of selectors

the whitespace can sometimes be part of an escape, e.g. `\ `

src/parse/mod.rs

@@ -333,14 +333,6 @@ impl<'a> Parser<'a> {
             return Err(("expected \"{\".", span).into());
         }
 
-        while let Some(c) = string.pop() {
-            if c == ' ' || c == ',' || c == '\t' {
-                continue;
-            }
-            string.push(c);
-            break;
-        }
-
         let sel_toks: Vec<Token> = string.chars().map(|x| Token::new(span, x)).collect();
 
         let mut iter = sel_toks.into_iter().peekmore();

src/selector/parse.rs

@@ -587,10 +587,10 @@ fn unvendor(name: &str) -> &str {
 /// with pseudo-class syntax (`:before`, `:after`, `:first-line`, or
 /// `:first-letter`)
 fn is_fake_pseudo_element(name: &str) -> bool {
-    match name.as_bytes()[0] {
-        b'a' | b'A' => name.to_ascii_lowercase() == "after",
-        b'b' | b'B' => name.to_ascii_lowercase() == "before",
-        b'f' | b'F' => match name.to_ascii_lowercase().as_str() {
+    match name.as_bytes().get(0) {
+        Some(b'a') | Some(b'A') => name.to_ascii_lowercase() == "after",
+        Some(b'b') | Some(b'B') => name.to_ascii_lowercase() == "before",
+        Some(b'f') | Some(b'F') => match name.to_ascii_lowercase().as_str() {
             "first-line" | "first-letter" => true,
             _ => false,
         },

tests/selectors.rs

@@ -653,6 +653,11 @@ test!(
     ":nth-child(ODD) {\n  color: &;\n}\n",
     ":nth-child(odd) {\n  color: :nth-child(odd);\n}\n"
 );
+test!(
+    escaped_space_at_end_of_selector_immediately_after_pseudo_color,
+    "a color:\\  {\n  color: &;\n}\n",
+    "a color:\\  {\n  color: a color:\\ ;\n}\n"
+);
 test!(
     super_selector_is_null_when_at_root,
     "@mixin foo {\n    #{if(&, 'true', 'false')} {\n        color: red;\n    }\n}\n\n@include foo;\n\na {\n    @include foo;\n}\n",