Rewrite the case of the selected text. Each text node is replaced with a
same-length node built by TextNode.withText, so every node keeps
exactly the marks it had. A bold run stays bold. Title case threads a
"mid-word" flag across node and block boundaries so a word split by a mark
boundary is not capitalized twice.
Rewrite the case of the selected text. Each text node is replaced with a same-length node built by TextNode.withText, so every node keeps exactly the marks it had. A bold run stays bold. Title case threads a "mid-word" flag across node and block boundaries so a word split by a mark boundary is not capitalized twice.