Seq :+ repeat parameter

I have created the following code and it seems to compile and run correctly:

val scaleButs = Seq(CanvButton("+", () => { scale = (scale * 
1.5).min(scaleMax); repaintMap() }),
      CanvButton("-", () => { scale = (scale / 1.5).max(scaleMin); 
repaintMap() }))
   val mapButs = scaleButs :+ (      
      CanvButton("<=", () => { mapFocus = mapFocus.subX(moveInc); 
repaintMap() }),
      CanvButton("=>", () => { mapFocus = mapFocus.addX(moveInc); 
repaintMap() }),
      CanvButton("Up", () => { mapFocus = mapFocus.addY(moveInc); 
repaintMap() }),
      CanvButton("down", () => { mapFocus = mapFocus.subY(moveInc); 
repaintMap() })
   )

But in the API documentation the :+ doesn't have a repeat parameter. I've 
looked in SeqLike.scala 
https://github.com/scala/scala/blob/v2.11.8/src/library/scala/collection/SeqLike.scala#L1 
and I can't see any repeat parameter for the :+ method there either.

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