Incorrect alignment of nested colored output

[HarrisonGrodin]

When calculating the maximum width for an expression, the show function for AbstractDict fails to take into account the fact that ANSI formatting codes do not take up character space. Thus, the output of other pairs within an AbstractDict can appear to be shifted unnecessarily.

Additionally, when shortening output to fit the screen, the ANSI codes are sometimes be split apart, showing strange filler characters and recoloring the arrow => and remaining output based on the previously-set color.

(Note: produced within an xterm-256color terminal.)

[vtjnash]

One fix fix may be #27430. I haven’t implemented it there yet though.

[HarrisonGrodin]

This issue also applies to arrays of pairs.

[vtjnash]

Not just limited to that either, an Matrix has the same issue:

In #27430, I've got this printing correctly for Dict now. The matrix code is more complex, so I'm only partway done with fixing it there.

[laborg]

Fixed by
#45521
#37568