Fix issue with alpha layering for AA dot drawing

source/blender/gpu/shaders/gpu_shader_point_uniform_color_aa_frag.glsl

@@ -17,4 +17,8 @@ void main() {
 
 	fragColor.rgb = color.rgb;
 	fragColor.a = mix(color.a, 0.0, smoothstep(radii[1], radii[0], dist));
+
+	if (fragColor.a == 0.0) {
+		discard;
+	}
 }

source/blender/gpu/shaders/gpu_shader_point_uniform_color_outline_aa_frag.glsl

@@ -26,6 +26,11 @@ void main() {
 		fragColor.rgb = outlineColor.rgb;
 		fragColor.a = mix(outlineColor.a, 0.0, smoothstep(radii[1], radii[0], dist));
 	}
-	else
+	else {
 		fragColor = mix(color, outlineColor, smoothstep(radii[3], radii[2], dist));
+	}
+
+	if (fragColor.a == 0.0) {
+		discard;
+	}
 }