Product Version = NetBeans IDE 8.2 (Build 201609300101)
Operating System = Linux version 4.7.5-200.fc24.x86_64 running on amd64
Java; VM; Vendor = 1.8.0_101
Runtime = Java HotSpot(TM) 64-Bit Server VM 25.101-b13

Reproducibility: Happens every time

STEPS:
  * I have the following indentation settings for all the languages:
      Expand Tabs to Spaces: yes
      Number of Spaces per indent: 2
      Tab Size: 2
    inherited by all the languages (PHP and Javascript included)
  * I'm in a PHP page with this javascript code (please consider also the number of spaces included):
        email = $('input#txtRegEmail').val(); 

        if(email === "") {
          $('div#regEmailError').html(A_ERR_MSG['ERR_EMAIL']);
          $('div#regEmailError').show();
          return false;
        } else if(!isEmail(email)) {
  * I make the following selection (please consider also the spaces):
        if(email === "") {
          $('div#regEmailError').html(A_ERR_MSG['ERR_EMAIL']);
          $('div#regEmailError').show();
          return false;
        } else 
     until just before the second if.
  * When I press Backspace to delete the code selected, the indentation get broken with the remaining if 
     starting at the beginning of the line instead to align under the existing "email = "
  * Same result in PHP code
  * Same result in NetBeans 8.1 

ACTUAL:
  the indentation of the existing code get broken deleting a selection of code

EXPECTED:
  the indentation of the code should be maintained