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FSContext discard

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#callbacks:

Old FSContext is discarded on rerender, so the number of callbacks doesn't grow indefinitely

Selectable rows

Name Capital Region Area
Aruba Oranjestad Americas 180.0
Afghanistan Kabul Asia 652230.0
Angola Luanda Africa 1246700.0
Anguilla The Valley Americas 91.0
Åland Islands Mariehamn Europe 1580.0
Albania Tirana Europe 28748.0
Andorra Andorra la Vella Europe 468.0
United Arab Emirates Abu Dhabi Asia 83600.0
Argentina Buenos Aires Americas 2780400.0
Armenia Yerevan Asia 29743.0
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scala 

    // Debug rerenderable:
    val table = new Table6Base
      with Table6BootrapStyling
      with Table6SelectableRows
      with Table6StandardColumns
      with Table6PaginatedWithSeqDataSource {
      override type R = Country

      override def defaultPageSize: Int = 10

      val ColName = ColStr("Name", _.name.common)
      val ColCapital = ColStr("Capital", _.capital.mkString(", "))
      val ColRegion = ColStr("Region", _.region)
      val ColArea = ColStr("Area", _.area.toString)

      override def columns(): List[C] = List(
        ColName
        , ColCapital
        , ColRegion
        , ColArea
        , ColSelectRow
      )

      override def seqRowsSource: Seq[Country] = CountriesData.data
    }

    new Widget {
      override def widgetTitle: String = "Selectable rows"

      override def transformWidgetCardBody(elem: Elem): Elem = super.transformWidgetCardBody(elem).p_0

      override def widgetTopRight()(implicit fsc: FSContext): NodeSeq =
        BSBtn().BtnDanger.toggler(
          () => RerendererDebugStatusState() == RerendererDebugStatus.Enabled,
          {
            case true =>
              RerendererDebugStatusState() = RerendererDebugStatus.Enabled
              JS.reload()
            case false =>
              RerendererDebugStatusState() = RerendererDebugStatus.Disabled
              JS.reload()
          },
          "Debug disabled",
          "Debug enabled",
        ) ++
          table.clearRowSelectionBtn.btn.ms_2 ++
          table.selectAllVisibleRowsBtn.btn.ms_2

      override def widgetContents()(implicit fsc: FSContext): NodeSeq = table.render()
    }.renderWidget()