IDEA 出现 This file is indented with tabs instead of 4 spaces提示
问题：Intellij IDEA 老出现 This file is indented with tabs instead of 4 spaces提示，
此提示是关于缩进用空格缩进还是tab缩进的问题，随习惯吧。
解决方法：在settings --> Editor --> Code Style，右边有个Indents Detection
将Detect and use existing file indents for editing的勾去掉，点击Apply保存设置
