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## Why The streaming TUI rerendered the entire mutable Markdown block whenever a newline-bearing delta arrived. For long fenced code blocks, this repeatedly parsed and syntax-highlighted the growing fence. ## What changed - Detect open, top-level, language-tagged code fences and append newly completed lines directly to the existing render. - Preserve Syntect parser state across appended lines so multiline syntax and the active theme remain consistent. - Fall back to the canonical Markdown renderer for ambiguous fence syntax, theme changes, incomplete lines, and highlighting limit transitions. ## Testing Added coverage that compares streamed output with full renders across syntax styles, Unicode, links, blank lines, fence variants, theme changes, and highlighting limits. A long-fence test also verifies that the rendered prefix is retained as new lines arrive. GitOrigin-RevId: 036db2b7bc93607083b8001f8b4fa3cbb58c713e