selectAllInCurrentLayer () {
    const currentLayer = this.getCurrentDrawing().getCurrentLayer()
    if (currentLayer) {
      this.currentMode = 'select'
      if (this.currentGroup) {
        this.selectOnly(this.currentGroup.children)
      } else {
        this.selectOnly(currentLayer.children)
      }
    }
  }
Clears the selection, then adds all elements in the current layer to the selection.
@function module:svgcanvas.SvgCanvas#selectAllInCurrentLayer
@returns {void}