Hitting Tab in Visual Studio selects block instead of adding indentation

Question

I am using Visual Studio 2015 and ReSharper 2016.2 and I have this strange behavior, that I probably activated (accidentally). When having the cursor in a line before the first word, hitting the Tab-key indents the line correctly:

When the cursor is inside of any word inside the line, hitting the Tab-key selects the word or block.

But the desired behavior would be to indent at the cursor (e.g. split a word into two words, if the cursor was inside of the word Stream after the letter r):

Does anyone know how this 'feature' is called? Does it come from ReSharper? Where can it be enabled or disabled?

Answer 1

Go to Resharper -> Options, in the left treeview select Editor Behavior and uncheck the last option Use Tab/Shift Tab keys for structural navigation.

Update for Resharper 2016.3.1.

Thanks to @Jordan for pointing this out!