hide fill icons when fill color transparent (#2414)

Co-authored-by: Panayiotis Lipiridis <lipiridis@gmail.com>

src/tests/utils.test.ts

@@ -0,0 +1,13 @@
+import * as utils from "../utils";
+
+describe("Test isTransparent", () => {
+  it("should return true when color is rgb transparent", () => {
+    expect(utils.isTransparent("#ff00")).toEqual(true);
+    expect(utils.isTransparent("#fff00000")).toEqual(true);
+    expect(utils.isTransparent("transparent")).toEqual(true);
+  });
+
+  it("should return false when color is not transparent", () => {
+    expect(utils.isTransparent("#ced4da")).toEqual(false);
+  });
+});