[FR, Winbox] Select master interface for vAP & VLANs automatically

This is a small quality-of-life/UX improvement, which despite years of use I still often misclick in WinBox. Some interfaces in ROS can have virtual interfaces attached to them (e.g. vAP for wireless and VLANs for other ones). When adding such interface a natural flow (at least for me and couple of folks I blind showed the UI to) is:

  1. Select interface I’m interested in
  2. Click [+]
  3. Select VLAN

On pictures the flow looks like that currently:
Screen Shot 2020-12-17 at 5.40.50 PM.png
Screen Shot 2020-12-17 at 5.41.01 PM.png

The issue is the new window which is brought to create the VLAN never populates the interface with the clicked one - (a) - but instead uses seemingly random one (last one used?):
Screen Shot 2020-12-17 at 5.41.05 PM.png
I searched on the forum but I didn’t see any mentions on this yet. I wonder if this would be hard to add as a feature in Winbox?