In IE9 only, the use of filter by variable is uncomfortable because of the IE9 rendering of input element.

Way to reproduce:

• on a process definition view, add a variable filter
• in the variable filter field, enter a value (something like: a="b")
• wait for the filter to be applied
• the field seems to still be focused (but it is not the case)
• at that point, the user might want to type something, but as the focus is gone, nothing happens and this is misleading