refactor(ui): isolate session components (#33670)

packages/session-ui/src/components/markdown-code-state.ts

@@ -0,0 +1,22 @@
+import type { MarkdownToken } from "./markdown-worker-protocol"
+
+export type RenderedCodeState = {
+  language: string
+  generation: number
+  stableCount: number
+  unstable: MarkdownToken[]
+  raw: string
+}
+
+export function shouldResetCodeTokens(
+  previous: RenderedCodeState | undefined,
+  next: { language: string; generation: number; stableCount: number; raw: string },
+) {
+  return (
+    !previous ||
+    previous.language !== next.language ||
+    previous.generation !== next.generation ||
+    next.stableCount < previous.stableCount ||
+    !next.raw.startsWith(previous.raw)
+  )
+}