Add integration test and fix hovering over the wire

styles/src/styleTree/tooltip.ts

@@ -1,5 +1,5 @@
 import Theme from "../themes/common/theme";
-import { backgroundColor, border, shadow, text } from "./components";
+import { backgroundColor, border, popoverShadow, text } from "./components";
 
 export default function tooltip(theme: Theme) {
   return {
@@ -7,7 +7,7 @@ export default function tooltip(theme: Theme) {
     border: border(theme, "secondary"),
     padding: { top: 4, bottom: 4, left: 8, right: 8 },
     margin: { top: 6, left: 6 },
-    shadow: shadow(theme),
+    shadow: popoverShadow(theme),
     cornerRadius: 6,
     text: text(theme, "sans", "secondary", { size: "xs", weight: "bold" }),
     keystroke: {