documents: lists go on inside quotes and after tabs; a waiting match lapses with its text and yields to a newer one

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/documents/document/mod.rs

@@ -79,8 +79,8 @@ pub struct MarkdownDocument {
     asks: u64,
     /// Its own write-backs whose changes are still to come.
     writes: usize,
-    /// A match asked for before its text was read.
-    showing: Option<Range<usize>>,
+    /// A match asked before its text was read; its version.
+    showing: Option<(Range<usize>, u64)>,
     focus: FocusHandle,
     on_link: Option<OnLink>,
     _subscriptions: Vec<Subscription>,