[GTK][HiDpi] Code cleanup for removal of non-cairo scale path.

Fixes #1300

Author: deepika-u

bundles/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/graphics/TextLayout.java

@@ -670,7 +670,7 @@ public void draw(GC gc, int x, int y, int selectionStart, int selectionEnd, Colo
 				if (ascentInPoints != -1 && descentInPoints != -1) {
 					height = Math.max (height, ascentInPoints + descentInPoints);
 				}
-				height += getSpacingInPixels();
+				height += getSpacing();
 				int width = (flags & SWT.FULL_SELECTION) != 0 ? 0x7fff : height / 3;
 				Cairo.cairo_rectangle(cairo, lineX, lineY, width, height);
 				Cairo.cairo_fill(cairo);
@@ -701,7 +701,7 @@ public void draw(GC gc, int x, int y, int selectionStart, int selectionEnd, Colo
 		selectionEnd = translateOffset(selectionEnd);
 		if (selectionForeground == null) selectionForeground = device.getSystemColor(SWT.COLOR_LIST_SELECTION_TEXT);
 		if (selectionBackground == null) selectionBackground = device.getSystemColor(SWT.COLOR_LIST_SELECTION);
-		int yExtent = extent ? getSpacingInPixels() : 0;
+		int yExtent = extent ? getSpacing() : 0;
 		boolean fullSelection = selectionStart == 0 && selectionEnd == length - 1;
 		if (fullSelection) {
 			long ptr = OS.pango_layout_get_text(layout);