Why won't IntelliJ use tabs?

Question

As per How can I use tabs for indentation in IntelliJ IDEA?, I have gone through and set each extension to "Use tab character" as seen below.

It doesn't work though - IntelliJ is still inserting spaces when I hit the tab button. Did I miss something? Where is intelliJ's [Please use tabs like I ef'ing told you to do] button?

(FYI, I'm using IntelliJ Ultimate 2016.2)

This looks promising...

... but apparently it's all lies :(

Answer 1

Go to Settings → Editor → Code Style and deselect ‘Detect and use existing file indents for editing’.

Answer 2

Maybe you have the option Settings->Editor->General->"Allow placement of caret inside tabs" checked.

Deselect it and try again.

Answer 3

If you open up the .editorconfig file, you will see something akin to the following

# editorconfig.org  
root = true  

[*]  
indent_style = spaces  
indent_size = 2  
end_of_line = lf  
charset = utf-8  
trim_trailing_whitespace = true  
insert_final_newline = true

I changed it to tab and 4, closed the project and reopened it.
I know this is an absurd step to have to take, and have an open bug report with them about it.