在 KDE Wayland 环境中使用 dbus 获取 UI 缩放比例

[Glavo]

No description provided.

[Glavo]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces automatic UI scale detection for KDE Wayland environments on Linux by querying D-Bus for the KScreen ScaleFactor. Feedback highlights a potential NullPointerException when setting system properties because the uiScale variable remains null in the D-Bus code path. Additionally, a correction was suggested for a log message to accurately reflect that the UI scale, rather than the system theme, is being retrieved.

[gemini-code-assist]

在通过 D-Bus 获取缩放比例的分支中（第 104-142 行），uiScale 变量保持为 null。由于 System.getProperties() 返回的是 Hashtable，调用 putIfAbsent 时传入 null 值会抛出 NullPointerException。此外，即使不抛出异常，也应该使用计算出的 scale 值，因为 JavaFX 的 uiScale 属性通常期望一个数值字符串，而不一定支持原始输入中的 % 或 dpi 后缀。

        if (scale > 0) {
            String scaleString = String.valueOf(scale);
            if (OperatingSystem.CURRENT_OS == OperatingSystem.WINDOWS) {
                System.getProperties().putIfAbsent("glass.win.uiScale", scaleString);
            } else if (OperatingSystem.CURRENT_OS == OperatingSystem.MACOS) {
                LOG.warning("macOS does not support setting UI scale, so it will be ignored");
            } else {
                System.getProperties().putIfAbsent("glass.gtk.uiScale", scaleString);
            }
        }

[Iamliuxiaozhen]

这是我的测试截图和环境：
环境：

• Ubuntu Studio 26.04
• KDE Plasma
• Wayland