Suggestion: larger hotspot for before/after slider

[echadwick-artist]

The hotspot for dragging the before/after vertical bar is 2 pixels wide, which makes it difficult to "grab".

Could we widen the hotspot to maybe 10 pixels wide, while keeping the vertical bar the same 2-pixel width?

[abasilak]

Commit af160e0505ca94375204a6c38dd944e75cf66d2d increased the hotspot area.