Grapheme Clusters and Terminal Emulators

Terminal emulators often face inconsistencies with cursor movement due to varied handling of grapheme clusters. While traditional methods like `wcwidth` work for single characters, they fall short for multi-codepoint graphemes like emoji and complex script characters. Mode 2027 is proposed as a solution, allowing terminals to opt-in for proper grapheme clustering, ensuring consistent cursor behavior. However, full implementation remains rare, and program authors must adapt to both legacy and modern terminal behaviors.