When highlighting or selecting text in Chinese PDFs on iPhone/iPad, the selection is forced to start from the beginning of the line or after punctuation marks. I cannot select the exact words I want. Please fix this to improve the reading experience for Chinese users.

在iPhone/iPad上阅读中文PDF时，高亮或选词会强制从行首或标点后开始，无法自由选取中间部分。请修复该问题，提升中文用户阅读体验。