LNode filtering display doesn't always update

[danyill]

When changing text on the left in the LNode screen and selecting new IEDs, on the LN class selection on the right, the filter disappears and only reappears when changing or modifying the text.

Reproduction steps:

1. Filter with text in the left and right search bar and make some selection.
   

2. Enter a changed filter text on the left hand side:

3. Select a new IED on the left hand side.

4. The display on the right updates but the text filter on the right is no longer applied correctly
   

Example File:

XAT_2_Substation.zip