md_analyze_emph: Call md_resolve_range() with proper chain.

Errorneously, we have called md_resolve_range() with mark chain derived
from the closer mark. In the case that the opener and closer marks
differ in length (and we have split one or the other), we pass in an
incorrect chain, which may lead to strange behavior in subsequent
analysis.

Fixes #98.

CHANGELOG.md

@@ -2,6 +2,14 @@
 # MD4C Change Log
 
 
+## Next Version (Work in Progress)
+
+Fixes:
+ * [#98](https://github.com/mity/md4c/issues/98):
+   Fix mis-detection of asterisk-encoded emphasis in some corner cases when
+   length of the opener and closer differs, as in `**a *b c** d*`.
+
+
 ## Version 0.4.1
 
 Unfortunately, 0.4.0 has been released with badly updated ChangeLog. Fixing

md4c/md4c.c

@@ -3699,16 +3699,17 @@ md_analyze_emph(MD_CTX* ctx, int mark_index)
         if(opener != NULL) {
             SZ opener_size = opener->end - opener->beg;
             SZ closer_size = mark->end - mark->beg;
+            MD_MARKCHAIN* opener_chain = md_mark_chain(ctx, mark_index);
 
             if(opener_size > closer_size) {
                 opener_index = md_split_emph_mark(ctx, opener_index, closer_size);
-                md_mark_chain_append(ctx, md_mark_chain(ctx, opener_index), opener_index);
+                md_mark_chain_append(ctx, opener_chain, opener_index);
             } else if(opener_size < closer_size) {
                 md_split_emph_mark(ctx, mark_index, closer_size - opener_size);
             }
 
             md_rollback(ctx, opener_index, mark_index, MD_ROLLBACK_CROSSING);
-            md_resolve_range(ctx, chain, opener_index, mark_index);
+            md_resolve_range(ctx, opener_chain, opener_index, mark_index);
             return;
         }
     }

test/coverage.txt

@@ -230,6 +230,17 @@ foo
 ````````````````````````````````
 
 
+### [Issue 97](https://github.com/mity/md4c/issues/97)
+
+
+```````````````````````````````` example
+*a **b c* d**
+.
+<p><em>a <em><em>b c</em> d</em></em></p>
+
+````````````````````````````````
+
+
 ## Code coverage
 
 ### `md_is_unicode_whitespace__()`