ATC tree view "flickering"

[Phil7789]

When using the atc tree view the width of the columns is resizing itself in a short time period (15 - 20 seconds). This results in a horizontal scrollbar to appear. After another 2 or 3 seconds the view resizes to its original value, but with the view moved up to the top.

So if you're e.g. scroll down to the GND controllers the width resizes, enlarging and shrinking, were after you are viewing the center controllers. This makes it very hard to check for "lower" frequencies (sectorwise)

OS: Win 10 64 bit Swift: 0.12.2