On Mon, Aug 17, 2020 at 05:22:57AM +0200, Damjan Jovanovic wrote:
> Signed-off-by: Damjan Jovanovic <damjan.jov@gmail.com>
> ---
>  dlls/riched20/richole.c       | 77 +++++++++++++++++++++++++--
>  dlls/riched20/tests/richole.c | 98 ++++++++++++++++++++++++++++++++++-
>  2 files changed, 169 insertions(+), 6 deletions(-)

> diff --git a/dlls/riched20/richole.c b/dlls/riched20/richole.c
> index 7c281ab364..1fd307eb92 100644
> --- a/dlls/riched20/richole.c
> +++ b/dlls/riched20/richole.c
> @@ -2191,17 +2191,63 @@ static HRESULT WINAPI ITextRange_fnMove(ITextRange *me, LONG unit, LONG count, L
>      return E_NOTIMPL;
>  }
> 
> +static HRESULT textrange_movestart(ITextRange *range, LONG unit, LONG count, LONG *delta)
> +{
> +    LONG old_start, old_end, new_start, new_end;
> +    HRESULT hr = S_OK;
> +
> +    if (!count)
> +    {
> +        if (delta)
> +            *delta = 0;
> +        return S_FALSE;
> +    }
> +
> +    ITextRange_GetStart(range, &old_start);
> +    ITextRange_GetEnd(range, &old_end);
> +    switch (unit)
> +    {
> +    case tomCharacter:
> +    {
> +        ME_TextEditor *editor;
> +        ME_Cursor cursor;
> +        LONG moved;
> +        ITextRangeImpl *This = impl_from_ITextRange(range);
> +        editor = This->child.reole->editor;
> +
> +        ME_CursorFromCharOfs(editor, old_start, &cursor);
> +        moved = ME_MoveCursorChars(editor, &cursor, count, FALSE);
> +        new_start = old_start + moved;
> +        new_end = old_end;
> +        if (new_end < new_start)
> +            new_end = new_start;
> +        if (delta)
> +            *delta = moved;
> +        break;
> +    }
> +    default:
> +        FIXME("unit %d is not supported\n", unit);
> +        return E_NOTIMPL;
> +    }
> +    if (new_start == old_start)
> +        hr = S_FALSE;
> +    ITextRange_SetStart(range, new_start);
> +    ITextRange_SetEnd(range, new_end);
> +
> +    return hr;
> +}
> +
>  static HRESULT WINAPI ITextRange_fnMoveStart(ITextRange *me, LONG unit, LONG count,
>                                               LONG *delta)
>  {
>      ITextRangeImpl *This = impl_from_ITextRange(me);
> 
> -    FIXME("(%p)->(%d %d %p): stub\n", This, unit, count, delta);
> +    TRACE("(%p)->(%d %d %p)\n", This, unit, count, delta);
> 
>      if (!This->child.reole)
>          return CO_E_RELEASED;
> 
> -    return E_NOTIMPL;
> +    return textrange_movestart(me, unit, count, delta);
>  }

I know textrange_moveend() is a thing, but it's not clear why.
I think all of the implementation of MoveStart should go in
ITextRange_fnMoveStart, then ITextSelection_fnMoveStart would call
ITextRage_MoveStart().