减去溢出按钮的宽度，如果它显示出来。
Subtract the width of the overflow button if it is displayed.
分组的宽度包含按钮间的填充空间和按钮的宽度总和。
The width of the box containing the buttons is the total width of the buttons plus the padding between them.
搜索框和按钮的宽度是190像素，这会设置logo的宽度。
The search box and button are 190 pixels wide, which sets the width for a logo.
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