Use the logic explained in the softtabstop help section for defining
the tabSize parameter in formatting requests. This means that:
- if softtabstop is 0, tabstop is used
- if softtabstop < 0, shiftwidth is used
- if softtabstop > 0, softtabstop is used
When inserting spaces instead of tabs, softtabstop is used in vim.
Therefor it would be more logical to use it when formatting instead
of the current tabstop.
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