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The Java Editor seems to ignore the General Indentation Settings. For example setting the "Number of Spaces per Indent" property to "4" in the General Indentation Settings and then setting the "Tab Size" property to "8" under Advanced Options -> Editing -> Editor Settings -> Java Editor will result in the Java Editor always using "8" spaces to represent one tab indent. This may just be the result of my lack of understanding of the relationship b/n the General settings and the Advanced settings for a specific editor.
Yes, the indentation settings are defintely confusing. The "Number of Spaces per Indent" is not the same as "Tab Size" under "Advanced Options -> Editing -> Editor Settings -> Java Editor". Have a look at issue 71545. *** This issue has been marked as a duplicate of 71545 ***