Ligthing gradients UI is completely broken if alpha channel set to zero#2995

Attached screenshot is what will happen. Color picker buttons are not interactible anymore in the game at this point.

Save file contents:

"AmbientSkyColor": {
  "r": 1.0,
  "g": 1.0,
  "b": 1.0,
  "a": 0.0
},
"AmbientEquatorColor": {
  "r": 1.0,
  "g": 1.0,
  "b": 1.0,
  "a": 0.0
},
"AmbientGroundColor": {
  "r": 0.0,
  "g": 0.0,
  "b": 0.0,
  "a": 0.0

Manually editing “a” to something non-zero will fix the issue, so simple limiter should be enough to deal with this.

edit: can’t edit teh titel, o wel