tools/sizes.py: Change Unicode box-drawing chars to that of double version by jjsuwa-sys3175 · Pull Request #8573 · esp8266/Arduino (original) (raw)
Due to historical circumstances, some of light/heavy version of Unicode box-drawing chars may have twice width of others (aka. "Zen-Kaku" in Japanese, means full-square), eg. All of '─'(U+2500), '│'(U+2502), '└'(U+2514) and '├'(U+251C) correspond to that in Windows Japanese fonts and locale.
Double versions, '═'(U+2550), '║'(U+2551), '╚'(U+255A) and '╠'(U+2560) are not like that.