border-color property does not work on custom stylesheet

[Mark81]

From here I learn I can customize a QLineEdit (but I guess any widget that supports the box model) using the border-color property.

In my Qt 6.8.2 desktop application I have this code:

if (QGuiApplication::styleHints()->colorScheme() == Qt::ColorScheme::Dark)
{
    w.setStyleSheet("* { gridline-color: dimgray; border-color: red; }");
}

The goal is to apply the stylesheet to all widgets at once.
Actually the gridline-color is honored, but the border-color does not:

As you can see the grid of the QTableView is grady (instead of the default black) but the QLineEdit border is still black.
Is my stylesheet wrong?

Here the content of my main.cpp:

#include "mainwindow.h"

#include <QStyleHints>
#include <QApplication>
#include <QDebug>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QCoreApplication::setApplicationVersion("v0.1");

    MainWindow w;
    // QGuiApplication::styleHints()->setColorScheme(Qt::ColorScheme::Light); <--- this does not work either
    if (QGuiApplication::styleHints()->colorScheme() == Qt::ColorScheme::Dark)
    {
        w.setStyleSheet("* { gridline-color: dimgray; border-color: red; }");
    }

    w.show();
    return a.exec();
}

[jsulm]

@Mark81 What is w in your code? Are you sure you apply that stylesheet on QLineEdit?

[Bonnie]

@Mark81 You need to write the full border style:

    border-width: 1px;
    border-style: solid;
    border-color: red;

or

border: 1px solid red

[Mark81]

@Bonnie said in border-color property does not work on custom stylesheet:

@Mark81 You need to write the full border style:

You're right. I didn't understand this from the docs!

Out of curiosity, to test the Light style I added this line:

QGuiApplication::styleHints()->setColorScheme(Qt::ColorScheme::Light);

but the theme is still dark (as per my system settings).
The docs (here) state I can set an explicit color scheme. Is there anything else I should set?

I'm aware it is slightly offtopic, but it is useful to test the stylesheet in different scenarios.