Properly changing window title text color

[ArthurSonzogni]

Discussed in #939

^{Originally posted by sentientbottleofwine October 20, 2024}
This might be a very simple question and I might be just missing something obvious, I tried and couldn't resolve my issue. When I try to make a window that has a title that's supposed to be colored and apply the color to the title the whole upper border of the window changes color:

Here's the code:

#include <ftxui/dom/elements.hpp>
#include <ftxui/screen/screen.hpp>

int main() {
    using namespace ftxui;
    auto render = window(text("Only text should be colored") | color(Color::Green), text("Contents")) | color(Color::White);
    auto screen = Screen::Create(
        Dimension::Full(),
        Dimension::Fit(render)
    );
    Render(screen, render);
    screen.Print();
}

I have no idea how to do this correctly. I greatly appreciate and thank any help.

[ArthurSonzogni]

Thanks!

This looks like a bug. I believe this is because the "title" is flexible by default and covers the whole line, causing the color decorator to apply to everything that is behind.

We probably want to fix this.