Fix behavior of `markdown_attribute` extension.

It now works as in PHP markdown extra.  Setting `markdown="1"` on
an outer tag affects all contained tags until it is reversed with
`markdown="0"`.  Closes #1378.

Added `stateMarkdownAttribute` to `ParserState`.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/Text/Pandoc/Parsing.hs b/src/Text/Pandoc/Parsing.hs
index 54c645fc5..f4f9178d0 100644
--- a/src/Text/Pandoc/Parsing.hs
+++ b/src/Text/Pandoc/Parsing.hs
@@ -879,6 +879,7 @@ data ParserState = ParserState
       -- annotate role classes too).
       stateCaption         :: Maybe Inlines, -- ^ Caption in current environment
       stateInHtmlBlock     :: Maybe String,  -- ^ Tag type of HTML block being parsed
+      stateMarkdownAttribute :: Bool,        -- ^ True if in markdown=1 context
       stateWarnings        :: [String]       -- ^ Warnings generated by the parser
     }
 
@@ -958,6 +959,7 @@ defaultParserState =
                   stateRstCustomRoles  = M.empty,
                   stateCaption         = Nothing,
                   stateInHtmlBlock     = Nothing,
+                  stateMarkdownAttribute = False,
                   stateWarnings        = []}
 
 -- | Succeed only if the extension is enabled.