Patch for SC_MARK_BAR to have a minimum width

Hi Neil,

I like to use a thin margin for markers in conjunction with SC_MARK_LEFTRECT. If I enable change history, the change history markers are drawn a single pixel in width. I’d like to propose a minimum width: 4 pixels (2 for the left and right foreground border, and 2 for the background fill). I know I can redefine the change history markers, but I think SC_MARK_BAR has benefits for wrapped lines and stuff that SC_MARK_LEFTRECT does not have.

src/LineMarker.cxx:
```
	case MarkerSymbol::Bar: {
			PRectangle rcBar = rcWhole;
	-		const XYPOSITION widthBar = std::floor(rcWhole.Width() / 3.0);
	+		const XYPOSITION widthBar = std::max(std::floor(rcWhole.Width() / 3.0), 4.0);
			rcBar.left = centreX - std::floor(widthBar / 2.0);
			rcBar.right = rcBar.left + widthBar;
```

Cheers,
Mitchell

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