Fix isInternalUrl for subdomain support

Refactor / reduce plumbing

app/components/Popover.js

@@ -0,0 +1,66 @@
+// @flow
+import * as React from 'react';
+import BoundlessPopover from 'boundless-popover';
+import styled, { keyframes } from 'styled-components';
+
+const fadeIn = keyframes`
+  from {
+    opacity: 0;
+  }
+
+  50% {
+    opacity: 1;
+  }
+`;
+
+const StyledPopover = styled(BoundlessPopover)`
+  animation: ${fadeIn} 150ms ease-in-out;
+  display: flex;
+  flex-direction: column;
+
+  line-height: 0;
+  position: absolute;
+  top: 0;
+  left: 0;
+  z-index: 9999;
+
+  svg {
+    height: 16px;
+    width: 16px;
+    position: absolute;
+
+    polygon:first-child {
+      fill: rgba(0, 0, 0, 0.075);
+    }
+    polygon {
+      fill: #fff;
+    }
+  }
+`;
+
+const Dialog = styled.div`
+  outline: none;
+  background: #fff;
+  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.05), 0 8px 16px rgba(0, 0, 0, 0.1),
+    0 2px 4px rgba(0, 0, 0, 0.1);
+  border-radius: 4px;
+  line-height: 1.5;
+  padding: 16px;
+  margin-top: 14px;
+  min-width: 200px;
+  min-height: 150px;
+`;
+
+export const Preset = BoundlessPopover.preset;
+
+export default function Popover(props: Object) {
+  return (
+    <StyledPopover
+      dialogComponent={Dialog}
+      closeOnOutsideScroll
+      closeOnOutsideFocus
+      closeOnEscKey
+      {...props}
+    />
+  );
+}