Fix GFM tables interfering with other constructs

Closes GH-19.

Co-authored-by: Christian Murphy <christian.murphy.42@gmail.com>

src/construct/gfm_table.rs

@@ -331,6 +331,7 @@ pub fn head_row_break(tokenizer: &mut Tokenizer) -> State {
     match tokenizer.current {
         None => {
             tokenizer.tokenize_state.seen = false;
+            tokenizer.tokenize_state.size = 0;
             State::Nok
         }
         Some(b'\n') => {
@@ -427,6 +428,7 @@ pub fn head_delimiter_start(tokenizer: &mut Tokenizer) -> State {
     tokenizer.interrupt = false;
 
     if tokenizer.lazy || tokenizer.pierce {
+        tokenizer.tokenize_state.size = 0;
         State::Nok
     } else {
         tokenizer.enter(Name::GfmTableDelimiterRow);

tests/fuzz.rs

@@ -68,5 +68,11 @@ fn fuzz() -> Result<(), String> {
         "6-b: container close after unclosed fenced code, with eol (list, GH-16)"
     );
 
+    assert_eq!(
+        to_html_with_options("> x\n``", &Options::gfm()),
+        Ok("<blockquote>\n<p>x</p>\n</blockquote>\n<p>``</p>".into()),
+        "7: lazy container lines almost starting fenced code (GH-19)"
+    );
+
     Ok(())
 }