Fixes #1800. TextView now uses the same colors as TextField.

[BDisp]

Fixes #1800.

Pull Request checklist:

• I've named my PR in the form of "Fixes #issue. Terse description."
• My code follows the style guidelines of Terminal.Gui - if you use Visual Studio, hit CTRL-K-D to automatically reformat your files before committing.
• My code follows the Terminal.Gui library design guidelines
• I ran dotnet test before commit
• I have made corresponding changes to the API documentation (using /// style comments)
• My changes generate no new warnings
• I have checked my code and corrected any poor grammar or misspellings
• I conducted basic QA to assure all features are working

[BDisp]

This commit 3308ab4 will be needed after the pr #1972 is merged.

[tig]

Please see my comments.

[arakis]

What is the "right" way to get the old colors / Behavior?

Old Behavior: Blue Background, Gray Text.
Now Gray Background, Darkgray Text.

In my case, I have a border/panel around the view, it looks much more natural to have the background blue.

[tznind]

Old Behavior: Blue Background, Gray Text. Now Gray Background, Darkgray Text.

In my case, I have a border/panel around the view, it looks much more natural to have the background blue.

You can set the colors by creating a ColorScheme and assigning it to the View. Make sure to only declare after you have called Application.Init ();

For example:

using Terminal.Gui;
using Attribute = Terminal.Gui.Attribute;

Application.Init();
var win = new Window("Example App (Ctrl+Q to quit)");

ColorScheme myscheme = new ColorScheme
{
    // Not Used (Normally Color when NOT tabbed into)
    Normal = new Attribute(
        Color.Red,Color.Black),

    // Not Used (Normally Selected text or Shortcut key when NOT tabbed into
    HotNormal = new Attribute(
        Color.Black,Color.Red),

    // Color of TextView when not readonly
    Focus = new Attribute(
        Color.Red,Color.Black),
    
    // Not Used (Normally the Shortcut color  color when tabbed into)
    HotFocus = new Attribute(
        Color.Black,Color.Red),

    // When ReadOnly
    Disabled = new Attribute(Color.Gray,Color.Black),
    
};
win.Add(
    new TextView()
    {
        Width = Dim.Fill(),
        Height = Dim.Fill() -1,
        ColorScheme = myscheme,
        AllowsTab = false,
    }
);
win.Add(
    new TextField()
    {
        Width = 10,
        Y = Pos.AnchorEnd(1)
    }
);

Application.Run(win);
Application.Shutdown();

UPDATE: Actually it looks like only Focus is used (and Disabled for when ReadOnly is true). The selection color is just the mirror of Focus (swap background and foreground)