﻿列头区（Grid）尺寸 1009x40 → 1009x40
列宽把手（PART_*HeaderGripper，可见且宽度>0）：0 个（修整5 要求 0）
禁用前后不同像素：整列头 394 个；标题列（跳过最左侧全选框列）0 个（0 = 标题列视觉完全一致）
说明：整列头残余差异来自 F13 表头全选框——点开始打印会把列表 IsEnabled=false，复选框按库的规则变暗，这是「打印中锁列表」的正常反馈，不是黑条；黑条＝列头模板里的列宽把手，已随自写列头模板去掉。
图：修整5-列头-打印前.png / 修整5-列头-打印中.png
--- 启用态列头可视树 ---
Grid size=1008.8x40 name=
  DataGridColumnHeader vis=Visible bg=#00FFFFFF fg=#FF201F1E size=1008.8x40 name=PART_FillerColumnHeader
    Border size=1008.8x40 name=HeaderBorder
      Grid size=992x39.2 name=
        ContentPresenter size=0x0 name=
        SymbolIcon size=0x0 name=SortIcon
          Grid size=0x0 name=
            TextBlock size=0x0 name=
  ItemsPresenter size=1008.8x40 name=
    DataGridCellsPanel size=1008.8x40 name=
      DataGridColumnHeader vis=Visible bg=#00FFFFFF fg=#FF201F1E size=52x40 name=
        Border size=52x40 name=HeaderBorder
          Grid size=35.2x39.2 name=
            ContentPresenter size=30.4x32 name=
              CheckBox vis=Visible bg=#06000000 fg=#E4000000 size=30.4x32 name=HeaderCheck
                BulletDecorator size=20x20 name=
                  Border size=20x20 name=ControlBorderIconPresenter
                    Border size=20x20 name=StrokeBorder
                      SymbolIcon size=0x0 name=ControlIcon
                        Grid size=0x0 name=
                          TextBlock size=0x0 name=
                  ContentPresenter size=0x0 name=ContentPresenter
            SymbolIcon size=0x0 name=SortIcon
              Grid size=0x0 name=
                TextBlock size=0x0 name=
      DataGridColumnHeader vis=Visible bg=#00FFFFFF fg=#FF201F1E size=432x40 name=
        Border size=432x40 name=HeaderBorder
          Grid size=415.2x39.2 name=
            ContentPresenter size=56x17.6 name=
              TextBlock size=56x17.6 name=
            SymbolIcon size=0x0 name=SortIcon
              Grid size=0x0 name=
                TextBlock size=0x0 name=
      DataGridColumnHeader vis=Visible bg=#00FFFFFF fg=#FF201F1E size=64x40 name=
        Border size=64x40 name=HeaderBorder
          Grid size=47.2x39.2 name=
            ContentPresenter size=28x17.6 name=
              TextBlock size=28x17.6 name=
            SymbolIcon size=0x0 name=SortIcon
              Grid size=0x0 name=
                TextBlock size=0x0 name=
      DataGridColumnHeader vis=Visible bg=#00FFFFFF fg=#FF201F1E size=60x40 name=
        Border size=60x40 name=HeaderBorder
          Grid size=43.2x39.2 name=
            ContentPresenter size=28x17.6 name=
              TextBlock size=28x17.6 name=
            SymbolIcon size=0x0 name=SortIcon
              Grid size=0x0 name=
                TextBlock size=0x0 name=
      DataGridColumnHeader vis=Visible bg=#00FFFFFF fg=#FF201F1E size=89.6x40 name=
        Border size=89.6x40 name=HeaderBorder
          Grid size=72.8x39.2 name=
            ContentPresenter size=28x17.6 name=
              TextBlock size=28x17.6 name=
            SymbolIcon size=0x0 name=SortIcon
              Grid size=0x0 name=
                TextBlock size=0x0 name=
      DataGridColumnHeader vis=Visible bg=#00FFFFFF fg=#FF201F1E size=121.6x40 name=
        Border size=121.6x40 name=HeaderBorder
          Grid size=104.8x39.2 name=
            ContentPresenter size=56x17.6 name=
              TextBlock size=56x17.6 name=
            SymbolIcon size=0x0 name=SortIcon
              Grid size=0x0 name=
                TextBlock size=0x0 name=
      DataGridColumnHeader vis=Visible bg=#00FFFFFF fg=#FF201F1E size=76x40 name=
        Border size=76x40 name=HeaderBorder
          Grid size=59.2x39.2 name=
            ContentPresenter size=28x17.6 name=
              TextBlock size=28x17.6 name=
            SymbolIcon size=0x0 name=SortIcon
              Grid size=0x0 name=
                TextBlock size=0x0 name=
      DataGridColumnHeader vis=Visible bg=#00FFFFFF fg=#FF201F1E size=112x40 name=
        Border size=112x40 name=HeaderBorder
          Grid size=95.2x39.2 name=
            ContentPresenter size=28x17.6 name=
              TextBlock size=28x17.6 name=
            SymbolIcon size=0x0 name=SortIcon
              Grid size=0x0 name=
                TextBlock size=0x0 name=
--- 禁用态列头可视树 ---
Grid size=1008.8x40 name=
  DataGridColumnHeader vis=Visible bg=#00FFFFFF fg=#FF201F1E size=1008.8x40 name=PART_FillerColumnHeader
    Border size=1008.8x40 name=HeaderBorder
      Grid size=992x39.2 name=
        ContentPresenter size=0x0 name=
        SymbolIcon size=0x0 name=SortIcon
          Grid size=0x0 name=
            TextBlock size=0x0 name=
  ItemsPresenter size=1008.8x40 name=
    DataGridCellsPanel size=1008.8x40 name=
      DataGridColumnHeader vis=Visible bg=#00FFFFFF fg=#FF201F1E size=52x40 name=
        Border size=52x40 name=HeaderBorder
          Grid size=35.2x39.2 name=
            ContentPresenter size=30.4x32 name=
              CheckBox vis=Visible bg=#06000000 fg=#5C000000 size=30.4x32 name=HeaderCheck
                BulletDecorator size=20x20 name=
                  Border size=20x20 name=ControlBorderIconPresenter
                    Border size=20x20 name=StrokeBorder
                      SymbolIcon size=0x0 name=ControlIcon
                        Grid size=0x0 name=
                          TextBlock size=0x0 name=
                  ContentPresenter size=0x0 name=ContentPresenter
            SymbolIcon size=0x0 name=SortIcon
              Grid size=0x0 name=
                TextBlock size=0x0 name=
      DataGridColumnHeader vis=Visible bg=#00FFFFFF fg=#FF201F1E size=432x40 name=
        Border size=432x40 name=HeaderBorder
          Grid size=415.2x39.2 name=
            ContentPresenter size=56x17.6 name=
              TextBlock size=56x17.6 name=
            SymbolIcon size=0x0 name=SortIcon
              Grid size=0x0 name=
                TextBlock size=0x0 name=
      DataGridColumnHeader vis=Visible bg=#00FFFFFF fg=#FF201F1E size=64x40 name=
        Border size=64x40 name=HeaderBorder
          Grid size=47.2x39.2 name=
            ContentPresenter size=28x17.6 name=
              TextBlock size=28x17.6 name=
            SymbolIcon size=0x0 name=SortIcon
              Grid size=0x0 name=
                TextBlock size=0x0 name=
      DataGridColumnHeader vis=Visible bg=#00FFFFFF fg=#FF201F1E size=60x40 name=
        Border size=60x40 name=HeaderBorder
          Grid size=43.2x39.2 name=
            ContentPresenter size=28x17.6 name=
              TextBlock size=28x17.6 name=
            SymbolIcon size=0x0 name=SortIcon
              Grid size=0x0 name=
                TextBlock size=0x0 name=
      DataGridColumnHeader vis=Visible bg=#00FFFFFF fg=#FF201F1E size=89.6x40 name=
        Border size=89.6x40 name=HeaderBorder
          Grid size=72.8x39.2 name=
            ContentPresenter size=28x17.6 name=
              TextBlock size=28x17.6 name=
            SymbolIcon size=0x0 name=SortIcon
              Grid size=0x0 name=
                TextBlock size=0x0 name=
      DataGridColumnHeader vis=Visible bg=#00FFFFFF fg=#FF201F1E size=121.6x40 name=
        Border size=121.6x40 name=HeaderBorder
          Grid size=104.8x39.2 name=
            ContentPresenter size=56x17.6 name=
              TextBlock size=56x17.6 name=
            SymbolIcon size=0x0 name=SortIcon
              Grid size=0x0 name=
                TextBlock size=0x0 name=
      DataGridColumnHeader vis=Visible bg=#00FFFFFF fg=#FF201F1E size=76x40 name=
        Border size=76x40 name=HeaderBorder
          Grid size=59.2x39.2 name=
            ContentPresenter size=28x17.6 name=
              TextBlock size=28x17.6 name=
            SymbolIcon size=0x0 name=SortIcon
              Grid size=0x0 name=
                TextBlock size=0x0 name=
      DataGridColumnHeader vis=Visible bg=#00FFFFFF fg=#FF201F1E size=112x40 name=
        Border size=112x40 name=HeaderBorder
          Grid size=95.2x39.2 name=
            ContentPresenter size=28x17.6 name=
              TextBlock size=28x17.6 name=
            SymbolIcon size=0x0 name=SortIcon
              Grid size=0x0 name=
                TextBlock size=0x0 name=
