A bugfix for the repeated focusing issue

[erhead]

Currently there's an issue in behavior which allows to enter an irrelevant value into the input. The steps to reproduce are as follows:

• Start typing an irrelevant value
• Click on that value (it must become selected after that)
• Click elsewhere to make the input lose focus.
  After that an irrelevant value stays in the input.
  The reason is that when we click on the input, the focus handler is called and therefore the "abbreviationBeforeFocus" variable is initialized with new irrelevant value from the input.
  The bugfix is to prevent the component from repeated focusing.