Tab type auto-detection fails when creating a new file

[Lilalas]

Prerequisites

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Description

Tab type auto-detection fails when creating a new .py file. Furthermore, the editor always inserts soft tabs regardless of the Soft Tabs setting (specified in Settings → Editor). It only detects hard tabs correctly if I manually paste a hard tab character and then reopen the file.

Steps to Reproduce

1. Make sure Tab Type is set to auto and Soft Tabs is off (Settings → Editor) and the package-specific settings for language-python are all default

First scenario:

2. Create a new Python source code file
3. Press tab to indent the line

~Second scenario:~

~2. Create a new Python source code file

3. Paste Python code that uses hard tabs
4. Press tab to indent a line~

Expected behavior: In the first scenario, I expect the editor to insert a hard tab because there was no other indentation in the document and Soft Tabs is disabled. ~In the second scenario, I expect the editor to automatically detect that the code uses hard tabs and therefore insert a hard tab when indenting a new line.~

Actual behavior: In both scenarios, the editor inserts a soft tab (as if Tab Type was set to soft).

Reproduces how often: Every time.

Versions

$ atom --version
$ apm --version
apm  1.19.0
npm  3.10.10
node 6.9.5 x64
atom 1.28.1
python 2.7.15rc1
git 2.17.1
$ lsb_release -idrc
Distributor ID: Ubuntu
Description:    Ubuntu 18.04 LTS
Release:    18.04
Codename:   bionic

language-python is on version 0.49.5.

Additional Information

Tab type auto-detection works fine when I disable language-python for Python, or write code in any other language.

[Lilalas]

I came to realize the second scenario is probably a bug on Atom’s side because it applies to other languages as well—only that they respect my Soft Tabs setting.

[Aerijo]

@Lilalas This package sets language specific settings, including softTabs to true. To change this, you can open language-python in settings and change the tab type there.