Prompt colors not configurable, not visible on white background

Prerequisites

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Steps to reproduce

The confirmation dialog uses white text which is not visible on white background. This color cannot by changed by any Set-PSReadLineOption or $PSStyle variable. The [Y] Yes uses light yellow which is barely visible (in fact never noticed it before taking screenshot) and everything else is completely white and therefore invisible to me.

I propose to add $PSStyle.Confirmation options, preferably Primary/Selected/Default, Other, Help and Text.

Expected behavior

# As rendered
> mkdir test
> '' > test/test.txt
> del test

Confirm
The item at /home/dkaszews/Downloads/test has children and the Recurse parameter was not specified. 
If you continue, all children will be removed with the item. Are you sure you want to continue?
[Y] Yes  [A] Yes to All  [N] No  [L] No to All  [S] Suspend  [?] Help (default is "Y"):

Actual behavior

# As rendered
> mkdir test
> '' > test/test.txt
> del test

Confirm
The item at /home/dkaszews/Downloads/test has children and the Recurse parameter was not specified. 
If you continue, all children will be removed with the item. Are you sure you want to continue?
                                                             [?] Help (default is "Y"):

Error details

No response

Environment data

Name                           Value
----                           -----
PSVersion                      7.3.0-preview.3
PSEdition                      Core
GitCommitId                    7.3.0-preview.3-304-gd02c59addc24e13da3b8ee5e1a8e7aa27e00c745
OS                             Linux 5.15.0-1013-raspi #15-Ubuntu SMP PREEMPT Mon Aug 8 06:33:06 UTC 2022
Platform                       Unix
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Visuals

The [Y] Yes is barely visible as light yellow, all other values except [?] Help cannot be seen at all.

Selecting text reveals it.

[dkaszews]

@jhoneill Fully agreed with what you say, and

Anything that says “The background is black, therefore yellow and white give good contrast” may fail when the RGB values for different colours are redefined. To cope with this I think we need a setting for PromptColor and PromptDefault colour. And the logical thing to do is to put it in PSStyle

is exactly what I would like to implement 😊

[dkaszews]

Setting $Host.UI.RawUI.BackgroundColor = White does fix the prompt, but causes other visual glitches due to ANSI ‘white’ being actually light gray and ‘BrightWhite’ not being a valid [System]::ConsoleColor.

In general, I think we should retire all options using [System]::ConsoleColor and switch over to ANSI. This will fix such problems and enable more features like 256 and 24bit colors and bold fonts.