[Win32] Convert dash offset for line attributes in GC into pixels

When setting line attributes in a GC, the properties containing
zoom-specific values are transformed from point into pixel values when
assigning them to the actual GC data. While this is properly done for
line width and dash, it is currently not done for the dash offset. With
this change, also the dash offset is properly transformed into a pixel
value.

Author: HeikoKlare

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/graphics/GC.java

@@ -4199,6 +4199,7 @@ public LineAttributes getLineAttributes () {
 	if(attributes.dash != null) {
 		attributes.dash = Win32DPIUtils.pixelToPoint(drawable, attributes.dash, deviceZoom);
 	}
+	attributes.dashOffset = Win32DPIUtils.pixelToPoint(drawable, attributes.dashOffset, deviceZoom);
 	return attributes;
 }
 
@@ -5367,8 +5368,9 @@ void apply() {
 	private LineAttributes convertToPixels(LineAttributes attributes) {
 		int zoom = getZoom();
 		float[] dashInPixels =  Win32DPIUtils.pointToPixel(drawable, attributes.dash, zoom);
+		float dashOffsetInPixels = Win32DPIUtils.pointToPixel(drawable, attributes.dashOffset, zoom);
 		float widthInPixels = Win32DPIUtils.pointToPixel(drawable, attributes.width, zoom);
-		LineAttributes lineAttributesInPixels = new LineAttributes(widthInPixels, attributes.cap, attributes.join, attributes.style, dashInPixels, attributes.dashOffset, attributes.miterLimit);
+		LineAttributes lineAttributesInPixels = new LineAttributes(widthInPixels, attributes.cap, attributes.join, attributes.style, dashInPixels, dashOffsetInPixels, attributes.miterLimit);
 		return lineAttributesInPixels;
 	}
 }