Enable anti-aliasing for Terminal text

Fixes #2295

Author: iloveeclipse

terminal/bundles/org.eclipse.terminal.control/src/org/eclipse/terminal/internal/textcanvas/TextLineRenderer.java

@@ -18,6 +18,7 @@
 
 import java.util.Map;
 
+import org.eclipse.swt.SWT;
 import org.eclipse.swt.graphics.Color;
 import org.eclipse.swt.graphics.Font;
 import org.eclipse.swt.graphics.GC;
@@ -63,6 +64,7 @@ public void drawLine(ITextCanvasModel model, GC gc, int line, int x, int y, int
 		}
 		Image buffer = new Image(gc.getDevice(), width, height);
 		GC doubleBufferGC = new GC(buffer);
+		doubleBufferGC.setAntialias(SWT.ON);
 		if (line < 0 || line >= getTerminalText().getHeight() || colFirst >= getTerminalText().getWidth()
 				|| colFirst - colLast == 0) {
 			fillBackground(doubleBufferGC, 0, 0, width, height);