Autoscroll when extending cell select (microsoft#13353)

Code change can only affect new keyboard shortcut operations

Author: greazer

src/client/datascience/editor-integration/codewatcher.ts

@@ -552,18 +552,23 @@ export class CodeWatcher implements ICodeWatcher {
  }
  editor.selection = selection;
  } else {
+ let newCell: ICellRange | undefined;
  // full cell range is selected now decide if expanding or contracting?
  if (isAnchorLessThanActive && startCellIndex < endCellIndex) {
  // anchor is above active, contract selection by cell below.
- const newEndCell = cells[endCellIndex - 1];
- editor.selection = new Selection(startCell.range.start, newEndCell.range.end);
+ newCell = cells[endCellIndex - 1];
+ editor.selection = new Selection(startCell.range.start, newCell.range.end);
  } else {
  // anchor is below active, expand selection by cell above.
  if (startCellIndex > 0) {
- const aboveCell = cells[startCellIndex - 1];
- editor.selection = new Selection(endCell.range.end, aboveCell.range.start);
+ newCell = cells[startCellIndex - 1];
+ editor.selection = new Selection(endCell.range.end, newCell.range.start);
  }
  }
+
+ if (newCell) {
+ editor.revealRange(newCell.range, TextEditorRevealType.Default);
+ }
  }
  }
 
@@ -613,20 +618,25 @@ export class CodeWatcher implements ICodeWatcher {
  }
  editor.selection = selection;
  } else {
+ let newCell: ICellRange | undefined;
  // full cell range is selected now decide if expanding or contracting?
  if (isAnchorLessEqualActive || startCellIndex === endCellIndex) {
  // anchor is above active, expand selection by cell below.
  if (endCellIndex < cells.length - 1) {
- const extendCell = cells[endCellIndex + 1];
- editor.selection = new Selection(startCell.range.start, extendCell.range.end);
+ newCell = cells[endCellIndex + 1];
+ editor.selection = new Selection(startCell.range.start, newCell.range.end);
  }
  } else {
  // anchor is below active, contract selection by cell above.
  if (startCellIndex < endCellIndex) {
- const contractCell = cells[startCellIndex + 1];
- editor.selection = new Selection(endCell.range.end, contractCell.range.start);
+ newCell = cells[startCellIndex + 1];
+ editor.selection = new Selection(endCell.range.end, newCell.range.start);
  }
  }
+
+ if (newCell) {
+ editor.revealRange(newCell.range, TextEditorRevealType.Default);
+ }
  }
  }