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ccs10.1.1版本中Tab键设置功能无效,应该如何设置

ccs10.1.1版本中我进行Tab键设置步骤如下:window--->Preferences--->General--->Editors--->Text Editors--->Displayed tab width:2

勾选Insert spaces for tabs

勾选Remove multiple spaces on backspace/delete

设置后感觉无效

我期望的效果是:

1.Tab键为2个空格(实际还是默认的一个Tab键为4个空格)

2.按Backspace/Delete键删除Tab应该是整体删除(应该删除定义的一个Tab键2个空格,实际是只能删除一个空格)

我的问题:

1.我的Tab设置是否正确?

2.如何设置满足我的期望?