This fixes unexpected undo action when zooming out with right mouse
click.
The call sequence in OnLButtonUp is already correct.
CORE-14539
(cherry picked from commit 1007a2e0f9)
- Check the denominator for zero for both zoomed width and height.
- Do not allow to move zoom slider above possible position.
- Move commonly used `zoomTo` function into new header file.
CORE-14539