Terminal crops wide character

[joaomoreno]

My PS1 starts with ➜ (one arrow and one space). The space is there so there's enough space to render the arrow. But the new canvas terminal simply crops the arrow.

[Tyriar]

Apparently this is a particularly popular wide character (dupe in #34121), "wide" characters that take up single widths are now cropped as characters own only their cell(s). This arrow char is similar to an emoji, wherein it is a single width character followed by a space. Maybe it should be special-cased and treated like an emoji until a proper solution is devised, due to its popularity (default oh-my-zsh?).

Related: xtermjs/xterm.js#942

[mjbvz]

Ran into #35102 on verification but the problem with the arrow character and other wide characters seems fixed