#2357 Truncation in Message::LineScroll

[Zufu Liu]

Split from [feature-requests:#749], current code (in Editor::WndProc()) truncates spaceWidth before multiply:

case Message::LineScroll:
    ScrollTo(topLine + lParam);
    HorizontalScrollTo(xOffset + static_cast<int>(wParam) * static_cast<int>(vs.spaceWidth));
    return 1;

it seems better to use HorizontalScrollTo(xOffset + static_cast<int>(static_cast<int>(wParam) * vs.spaceWidth)); or use std::lround().

[Neil Hodgson]

Committed as [bafddd].

[Neil Hodgson]

Committed as [bafddd].