support indented gitlab math block

Author: shahamran

mdx_math.py

@@ -63,10 +63,10 @@ def run(self, lines):
         math_blocks = []
 
         for line_number, line in enumerate(lines):
-            if line == '```math' and not inside_math_block:
+            if line.strip() == '```math' and not inside_math_block:
                 math_block_start = line_number
                 inside_math_block = True
-            if line == '```' and inside_math_block:
+            if line.strip() == '```' and inside_math_block:
                 math_blocks.append((math_block_start, line_number))
                 inside_math_block = False
 

test.py

@@ -30,6 +30,7 @@ def r(mkd_name, html_name, **config):
     test_standalone_latex_preview = r('standalone_latex', 'standalone_preview', add_preview=True)
     test_standalone_tex = r('standalone_tex', 'standalone')
     test_standalone_gitlab = r('standalone_gitlab', 'standalone_gitlab', use_gitlab_delimiters=True)
+    test_standalone_gitlab_nested = r('standalone_gitlab_nested', 'standalone_gitlab_nested', use_gitlab_delimiters=True)
     test_begin_end = r('beginend', 'beginend')
     test_begin_end_preview = r('beginend', 'beginend_preview', add_preview=True)
     test_inline_asciimath = r('inline_asciimath', 'inline_asciimath', use_asciimath=True)

test_data/standalone_gitlab_nested.html

@@ -0,0 +1,7 @@
+<ul>
+<li>in list:
+<script type="math/tex; mode=display">
+  e^{i \varphi} =
+  \cos \varphi + i \sin \varphi
+</script></li>
+</ul>

test_data/standalone_gitlab_nested.mkd

@@ -0,0 +1,5 @@
+- in list:
+  ```math  
+  e^{i \varphi} =
+  \cos \varphi + i \sin \varphi
+  ```