Syntax: fix ==highlight== at beginning of paragraphs

Author: deathaxe

syntaxes/Markdown.sublime-syntax

@@ -19,17 +19,17 @@ variables:
   atx_heading_space: (?:(?=[ \t]+#+[ \t]*$)|[ \t]+|$) # consume spaces only if heading is not empty to ensure `atx_heading_end` can fully match closing hashes
   atx_heading_end: (?:[ \t]+(#+))?[ \t]*($\n?)        # \n is optional so ## is matched as end punctuation in new document (at eof)
 
-  setext_heading_or_paragraph: ^(?:[ ]{,3}=+|(?=[ ]{,3}\S))   # between 0 and 3 spaces, followed by non-whitespace (consume equal signs as paragraphs may start with them)
-  setext_heading_escape: ^(?=[ ]{,3}(?:=+|-+)[ \t]*$)         # between 0 and 3 spaces, followed by at least one hyphen or equal sign (setext underline can be of any length)
-  setext_heading1_escape: ^(?=[ ]{,3}=+[ \t]*$)               # between 0 and 3 spaces, followed by at least one equal sign (setext underline can be of any length)
-  setext_heading1_end: ^[ ]{,3}(=+)[ \t]*$(\n?)               # between 0 and 3 spaces, followed by at least one equal sign (setext underline can be of any length)
-  setext_heading2_end: ^[ ]{,3}(-+)[ \t]*$(\n?)               # between 0 and 3 spaces, followed by at least one hyphen (setext underline can be of any length)
-
-  list_setext_heading_or_paragraph: (?:[ \t]*=+|(?=[ \t]*\S))  # any number of spaces, followed by non-whitespace (consume equal signs as paragraphs may start with them)
-  list_setext_heading_escape: ^(?=[ \t]{2,}(?:==+|--+)[ \t]*$) # two or more spaces, followed by at least one hyphen or equal sign (setext underline can be of any length, but ST needs at least 2 to avoid ambiguity with empty list items)
-  list_setext_heading1_escape: ^(?=[ \t]{2,}==+[ \t]*$)        # two or more spaces, followed by at least one equal sign (setext underline can be of any length, but ST needs at least 2 to avoid ambiguity with empty list items)
-  list_setext_heading1_end: ^[ \t]{2,}(==+)[ \t]*$(\n?)        # two or more spaces, followed by at least one equal sign (setext underline can be of any length, but ST needs at least 2 to avoid ambiguity with empty list items)
-  list_setext_heading2_end: ^[ \t]{2,}(--+)[ \t]*$(\n?)        # two or more spaces, followed by at least one hyphen (setext underline can be of any length, but ST needs at least 2 to avoid ambiguity with empty list items)
+  setext_heading_or_paragraph: ^(?:[ ]{,3}=+[ \t]*$|(?=[ ]{,3}\S))    # between 0 and 3 spaces, followed by non-whitespace (consume equal signs as paragraphs may start with them)
+  setext_heading_escape: ^(?=[ ]{,3}(?:=+|-+)[ \t]*$)                 # between 0 and 3 spaces, followed by at least one hyphen or equal sign (setext underline can be of any length)
+  setext_heading1_escape: ^(?=[ ]{,3}=+[ \t]*$)                       # between 0 and 3 spaces, followed by at least one equal sign (setext underline can be of any length)
+  setext_heading1_end: ^[ ]{,3}(=+)[ \t]*$(\n?)                       # between 0 and 3 spaces, followed by at least one equal sign (setext underline can be of any length)
+  setext_heading2_end: ^[ ]{,3}(-+)[ \t]*$(\n?)                       # between 0 and 3 spaces, followed by at least one hyphen (setext underline can be of any length)
+
+  list_setext_heading_or_paragraph: (?:[ \t]*=+[ \t]*$|(?=[ \t]*\S))  # any number of spaces, followed by non-whitespace (consume equal signs as paragraphs may start with them)
+  list_setext_heading_escape: ^(?=[ \t]{2,}(?:==+|--+)[ \t]*$)        # two or more spaces, followed by at least one hyphen or equal sign (setext underline can be of any length, but ST needs at least 2 to avoid ambiguity with empty list items)
+  list_setext_heading1_escape: ^(?=[ \t]{2,}==+[ \t]*$)               # two or more spaces, followed by at least one equal sign (setext underline can be of any length, but ST needs at least 2 to avoid ambiguity with empty list items)
+  list_setext_heading1_end: ^[ \t]{2,}(==+)[ \t]*$(\n?)               # two or more spaces, followed by at least one equal sign (setext underline can be of any length, but ST needs at least 2 to avoid ambiguity with empty list items)
+  list_setext_heading2_end: ^[ \t]{2,}(--+)[ \t]*$(\n?)               # two or more spaces, followed by at least one hyphen (setext underline can be of any length, but ST needs at least 2 to avoid ambiguity with empty list items)
 
   block_quote: (?:[ ]{,3}(>)[ ]?)                     # between 0 and 3 spaces, followed by a greater than sign, (followed by any character or the end of the line = "only care about optional space!")
   indented_code_block: (?:[ ]{4}|[ ]{0,3}\t)          # a visual tab of width 4 consisting of 4 spaces or 0 to 3 spaces followed by 1 tab

tests/syntax_test_markdown.md

@@ -7288,6 +7288,11 @@ __test <span>text__ *formatted</span>*
 
 # TEST: HIGHLIGHT #############################################################
 
+  ==highlight==
+| ^^^^^^^^^^^^^ markup.highlight.markdown
+| ^^ punctuation.definition.highlight.begin.markdown
+|            ^^ punctuation.definition.highlight.end.markdown
+
 __==bold highlight==__
 | <- markup.bold.markdown punctuation.definition.bold.begin.markdown
 |^ markup.bold.markdown - markup.highlight
@@ -7352,9 +7357,9 @@ ___==bold italic highlight==___
 |                           ^ punctuation.definition.italic.end.markdown
 |                            ^^ punctuation.definition.bold.end.markdown
 
-=Hi= Hello, world!
+=Hi= Hello, ===world===!
 | <- - punctuation.definition.highlight
-|^^^^^^^^^^^^^^^^^ meta.paragraph - markup
+|^^^^^^^^^^^^^^^^^^^^^^^ meta.paragraph - markup
 |  ^ - punctuation.definition.highlight
 
 This =text==== is ====curious=.
@@ -7417,6 +7422,69 @@ A ==![image $\ce{H2O}$.](./img/image6.png){#fig:image6 height=12.09cm }==
 |                                                                     ^ punctuation.definition.attributes.end.markdown
 |                                                                      ^^ punctuation.definition.highlight.end.markdown
 
+- ==highlight==
+| ^^^^^^^^^^^^^ markup.highlight.markdown
+| ^^ punctuation.definition.highlight.begin.markdown
+|            ^^ punctuation.definition.highlight.end.markdown
+
+1. ==highlight==
+|  ^^^^^^^^^^^^^ markup.highlight.markdown
+|  ^^ punctuation.definition.highlight.begin.markdown
+|             ^^ punctuation.definition.highlight.end.markdown
+
+Heading
+=======
+==highlight==
+| <- meta.paragraph.markdown markup.highlight.markdown punctuation.definition.highlight.begin.markdown
+|^^^^^^^^^^^^ meta.paragraph.markdown markup.highlight.markdown
+
+Heading
+-------
+==highlight==
+| <- meta.paragraph.markdown markup.highlight.markdown punctuation.definition.highlight.begin.markdown
+|^^^^^^^^^^^^ meta.paragraph.markdown markup.highlight.markdown
+
+==
+==highlight==
+| <- meta.paragraph.markdown markup.highlight.markdown punctuation.definition.highlight.begin.markdown
+|^^^^^^^^^^^^ meta.paragraph.markdown markup.highlight.markdown
+
+===
+==highlight==
+| <- meta.paragraph.markdown markup.highlight.markdown punctuation.definition.highlight.begin.markdown
+|^^^^^^^^^^^^ meta.paragraph.markdown markup.highlight.markdown
+
+---
+==highlight==
+| <- meta.paragraph.markdown markup.highlight.markdown punctuation.definition.highlight.begin.markdown
+|^^^^^^^^^^^^ meta.paragraph.markdown markup.highlight.markdown
+
+Heading
+==
+===not highlighted===
+| <- meta.paragraph.markdown - markup
+|^^^^^^^^^^^^^^^^^^^^ meta.paragraph.markdown - markup
+
+Heading
+--
+===not highlighted===
+| <- meta.paragraph.markdown - markup
+|^^^^^^^^^^^^^^^^^^^^ meta.paragraph.markdown - markup
+
+==
+===not highlighted===
+| <- meta.paragraph.markdown - markup
+|^^^^^^^^^^^^^^^^^^^^ meta.paragraph.markdown - markup
+
+===
+===not highlighted===
+| <- meta.paragraph.markdown - markup
+|^^^^^^^^^^^^^^^^^^^^ meta.paragraph.markdown - markup
+
+---
+===not highlighted===
+| <- meta.paragraph.markdown - markup
+|^^^^^^^^^^^^^^^^^^^^ meta.paragraph.markdown - markup
 
 # TEST: STRIKETHROUGH #########################################################