Jump to the boundary between files and folders

BetweenFilesAndFolders.js

var FV = GetFolderView(Ctrl,pt);
var Items = FV.Items();
var bFolder = !IsFolderEx(Items.Item(0));
var nCount = Items.Count;
var nIndex = Math.floor((nCount - 1) / 2);
var nDiff = nIndex;
while (nDiff) {
  if (bFolder ^ IsFolderEx(Items.Item(nIndex))) {
    nIndex += nDiff;
  } else {
    nIndex -= nDiff;
  }
  nDiff = Math.floor(nDiff / 2);
}
while (bFolder ^ IsFolderEx(Items.Item(nIndex))) {
  if (nIndex++ >= nCount) {
    break;
  };
}
FV.SelectItem(Items.Item(nIndex), SVSI_SELECT | SVSI_DESELECTOTHERS | SVSI_ENSUREVISIBLE | SVSI_FOCUSED);