Controller - Shift + Tab should not remove characters, only tabs

[DariusMuscalu]

Inside the method _removeTabCharacter() logic, when pressing shift + tab even though there aren't any tab char added. The logic is going to remove 4 chars before the charet. That's not what we intend. One possible solution to this is to verify if there are 4 whitespaces before the charet. If there are, apply the method logic, else do not.

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