Fix smartquotes around softbreaks

close https://github.com/markdown-it/markdown-it/issues/430

lib/rules_core/smartquotes.js

@@ -59,7 +59,8 @@ function process_inlines(tokens, state) {
         lastChar = text.charCodeAt(t.index - 1);
       } else {
         for (j = i - 1; j >= 0; j--) {
-          if (tokens[j].type !== 'text') { continue; }
+          if (tokens[j].type === 'softbreak' || tokens[j].type === 'hardbreak') break; // lastChar defaults to 0x20
+          if (tokens[j].type !== 'text') continue;
 
           lastChar = tokens[j].content.charCodeAt(tokens[j].content.length - 1);
           break;
@@ -75,7 +76,8 @@ function process_inlines(tokens, state) {
         nextChar = text.charCodeAt(pos);
       } else {
         for (j = i + 1; j < tokens.length; j++) {
-          if (tokens[j].type !== 'text') { continue; }
+          if (tokens[j].type === 'softbreak' || tokens[j].type === 'hardbreak') break; // nextChar defaults to 0x20
+          if (tokens[j].type !== 'text') continue;
 
           nextChar = tokens[j].content.charCodeAt(0);
           break;

test/fixtures/markdown-it/smartquotes.txt

@@ -109,3 +109,31 @@ Quotes at the start/end of the tokens:
 <p>“foo <em>bar</em>”</p>
 <p>“<em>foo bar</em>”</p>
 .
+
+Should treat softbreak as a space:
+.
+"this"
+and "that".
+
+"this" and
+"that".
+.
+<p>“this”
+and “that”.</p>
+<p>“this” and
+“that”.</p>
+.
+
+Should treat hardbreak as a space:
+.
+"this"\
+and "that".
+
+"this" and\
+"that".
+.
+<p>“this”<br>
+and “that”.</p>
+<p>“this” and<br>
+“that”.</p>
+.