为 Editor GUI 控件字段保留的最小宽度（以像素为单位）。
大多数 Editor GUI 控件由标签和控制字段本身组成。字段的最小宽度由 fieldWidth 值控制。字段通常看起来比最小宽度要宽，因为 Editor GUI 控件通常设置为占用一个 Rect，该 Rect 会扩展以填充可用的水平空间。在此 Rect 中，该字段将占用 EditorGUIUtility.labelWidth 未使用的所有空间。
fieldWidth 还控制 EditorGUI.Slider 控件内文本字段的宽度。
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