Paint Whole FormText to Avoid Rendering Artifacts

This commit updates the painting logic of FormText to render the entire content every time, rather than in segments. Painting in parts—particularly during scrolling—can introduce precision loss when using fractional (e.g., 1.25x, 1.75x) scaling factors. This may result in skipped pixels and visual glitches in the UI.

Fixes: #2997

Author: amartya4256

bundles/org.eclipse.ui.forms/src/org/eclipse/ui/forms/widgets/FormText.java

@@ -1554,7 +1554,8 @@ private void paint(PaintEvent e) {
 		ensureBoldFontPresent(getFont());
 		gc.setForeground(getForeground());
 		gc.setBackground(getBackground());
-		repaint(gc, e.x, e.y, e.width, e.height);
+		Point size = getSize();
+		repaint(gc, 0, 0, size.x, size.y);
 	}
 
 	private void repaint(GC gc, int x, int y, int width, int height) {