feat: only comments may follow a concise ; line's html comment

.changeset/semicolon-html-comment.md

@@ -0,0 +1,5 @@
+---
+"htmljs-parser": minor
+---
+
+Report code after an html comment that follows a concise `;` (eg `div; <!-- a --> span`) as an error, as after any other comment there, instead of reading it as a new line nested in the tag. More comments may still follow.

src/__tests__/fixtures/invalid-code-after-semicolon-html-comment/__snapshots__/invalid-code-after-semicolon-html-comment.expected.txt

@@ -0,0 +1,17 @@
+1╭─ div; <!-- a --> <!-- b --> // c
+ │  │   ││   │      │   │      │ ╰─ comment.value " c"
+ │  │   ││   │      │   │      ╰─ comment "// c"
+ │  │   ││   │      │   ╰─ comment.value " b "
+ │  │   ││   │      ╰─ comment "<!-- b -->"
+ │  │   ││   ╰─ comment.value " a "
+ │  │   │╰─ comment "<!-- a -->"
+ │  │   ╰─ openTagEnd
+ ╰─ ╰─ tagName "div"
+2╭─ span; <!-- d --> p
+ │  │    ││   │      ╰─ error(INVALID_CODE_AFTER_SEMICOLON:A semicolon indicates the end of a line. Only comments may follow it.)
+ │  │    ││   ╰─ comment.value " d "
+ │  │    │╰─ comment "<!-- d -->"
+ │  │    ╰─ openTagEnd
+ │  ├─ closeTagEnd(div)
+ ╰─ ╰─ tagName "span"
+3╰─ 

src/__tests__/fixtures/invalid-code-after-semicolon-html-comment/input.marko

@@ -0,0 +1,2 @@
+div; <!-- a --> <!-- b --> // c
+span; <!-- d --> p

src/states/CONCISE_HTML_CONTENT.ts

@@ -188,6 +188,11 @@ export const CONCISE_HTML_CONTENT: StateDefinition = {
 
         break;
       }
+      case STATE.HTML_COMMENT:
+        // Only reached after a ";" (a line starting with "<" is an html
+        // block), so only comments may follow it either.
+        STATE.endConciseLine(this, this.data);
+        break;
     }
   },
 };