@ApiStatus.Internal
  public @NotNull IntPair getCustomRegionsYAdjustment(int offset, int prevFoldRegionIndex) {
    return myFoldTree.getCustomRegionsYAdjustment(offset, prevFoldRegionIndex);
  }
@ApiStatus.Internal
  public @NotNull IntPair getCustomRegionsYAdjustment(int offset, int prevFoldRegionIndex)