Add non-system-border option on Windows

Sine Striker

2023-12-22 c837319767bb609c6ec806336e49a347c77b11d3

 src/core/style/styleagent.cpp

@@ -8,9 +8,12 @@
    StyleAgentPrivate::StyleAgentPrivate() {
    }

    StyleAgentPrivate::~StyleAgentPrivate() = default;
    StyleAgentPrivate::~StyleAgentPrivate() {
        removeSystemThemeHook();
    }

    void StyleAgentPrivate::init() {
        setupSystemThemeHook();
    }

    void StyleAgentPrivate::notifyThemeChanged(StyleAgent::SystemTheme theme) {
@@ -23,13 +26,9 @@
    }

    StyleAgent::StyleAgent(QObject *parent) : StyleAgent(*new StyleAgentPrivate(), parent) {
        Q_D(StyleAgent);
        d->setupSystemThemeHook();
    }

    StyleAgent::~StyleAgent() {
        Q_D(StyleAgent);
        d->removeSystemThemeHook();
    }

    StyleAgent::SystemTheme StyleAgent::systemTheme() const {