Rework strong and emph

- Star and underscore not parsed as strong/emph inside of words
- Stars/underscores must be balanced and they cannot go over paragraph break
- New `strong` and `emph` classes

1 files changed, 5 insertions, 3 deletions

diff --git a/src/parse/incremental.rs b/src/parse/incremental.rs
index 9dd5bec1..fb927c24 100644
--- a/src/parse/incremental.rs
+++ b/src/parse/incremental.rs
@@ -435,10 +435,12 @@ impl NodeKind {
             | Self::LeftParen
             | Self::RightParen => SuccessionRule::Unsafe,
 
+            // These work similar to parentheses.
+            Self::Star | Self::Underscore => SuccessionRule::Unsafe,
+
             // Replacing an operator can change whether the parent is an
-            // operation which makes it unsafe. The star can appear in markup.
-            Self::Star
-            | Self::Comma
+            // operation which makes it unsafe.
+            Self::Comma
             | Self::Semicolon
             | Self::Colon
             | Self::Plus