message: TermControl: set the scrollbar jump distance to one screenful
  Most applications with scrollable content seem to define the "large
  jump" distance as about a screenful of content. You can see this in long
  pages in Settings and documents in Notepad.
  We just weren't configuring ScrollBar here.
  Fixes
diff: @@ -156,6 +156,7 @@ namespace winrt::Microsoft::Terminal::TerminalControl::implementation
  scrollBar.Maximum(update.newMaximum);
  scrollBar.Minimum(update.newMinimum);
  scrollBar.ViewportSize(update.newViewportSize);
  + scrollBar.LargeChange(std::max(update.newViewportSize - 1, 0.)); // scroll one "screenful" at a time when the scroll bar is clicked
  control->_isInternalScrollBarUpdate = false;
  }
  @@ -699,6 +700,7 @@ namespace winrt::Microsoft::Terminal::TerminalControl::implementation
  ScrollBar().Minimum(0);
  ScrollBar().Value(0);
  ScrollBar().ViewportSize(bufferHeight);
  + ScrollBar().LargeChange(std::max<SHORT>(bufferHeight - 1, 0)); // scroll one "screenful" at a time when the scroll bar is clicked
  localPointerToThread->EnablePainting();
  