Description

Improves the documentation for the following event subtypes in Event.hpp
that previously only had a one-line description:

• FocusLost
• FocusGained
• MouseEntered
• MouseLeft
• MouseWheelScrolled
• MouseButtonPressed
• MouseButtonReleased
• MouseMoved

Closes #3663

This PR is related to the issue #3663

Tasks

• Tested on Linux
• Tested on Windows
• Tested on macOS
• Tested on iOS
• Tested on Android

How to test this PR?

Run a small SFML program that prints event names to the console
while interacting with the window (moving mouse, clicking,
scrolling, Alt+Tab etc.) and verify the documented behavior
matches what is observed.

Note: Joystick, touch, and sensor events were left undocumented
as physical devices were not available for testing.

#include <SFML/Graphics.hpp>
#include <SFML/Window.hpp>
#include

int main()
{
sf::RenderWindow window(sf::VideoMode({800, 600}), "SFML Event Tester");

while (window.isOpen())
{
    while (const std::optional event = window.pollEvent())
    {
        if (event->is<sf::Event::Closed>())
            window.close();
        else if (event->is<sf::Event::FocusGained>())
            std::cout << "FocusGained fired!\n";
        else if (event->is<sf::Event::FocusLost>())
            std::cout << "FocusLost fired!\n";
        else if (event->is<sf::Event::MouseEntered>())
            std::cout << "MouseEntered fired!\n";
        else if (event->is<sf::Event::MouseLeft>())
            std::cout << "MouseLeft fired!\n";
    }

    window.clear(sf::Color::Black);
    window.display();
}

}

#include <SFML/Graphics.hpp>

int main()
{
    sf::RenderWindow window(sf::VideoMode({1280, 720}), "Minimal, complete and verifiable example");
    window.setFramerateLimit(60);

    while (window.isOpen())
    {
        while (const std::optional event = window.pollEvent())
        {
            if (event->is<sf::Event::Closed>())
                window.close();
        }

        window.clear();
        window.display();
    }
}