Preserve blank lines between JSX attributes (#19161)

changelog_unreleased/javascript/19161.md

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+#### Preserve blank lines between JSX attributes (#19161 by @Poliklot)
+
+Prettier now keeps one existing blank line between JSX attributes, consistent with how it preserves blank lines in many other places. Multiple blank lines are still collapsed to one.
+
+<!-- prettier-ignore -->
+```jsx
+// Input
+<Button
+  type="submit"
+  variant="primary"
+  size="large"
+
+
+
+  disabled={isSubmitting}
+  onClick={handleSubmit}
+/>;
+
+// Prettier stable
+<Button
+  type="submit"
+  variant="primary"
+  size="large"
+  disabled={isSubmitting}
+  onClick={handleSubmit}
+/>;
+
+// Prettier main
+<Button
+  type="submit"
+  variant="primary"
+  size="large"
+
+  disabled={isSubmitting}
+  onClick={handleSubmit}
+/>;
+```