rewrite popover because v-tooltip is slow as heck

src/modules/popover.js

@@ -0,0 +1,31 @@
+import { omit } from 'lodash'
+import { set } from 'vue'
+
+const popover = {
+  state: {
+    popovers: {}
+  },
+  mutations: {
+    registerPopover (state, { id, el }) {
+      set(state.popovers, id, el)
+    },
+    unregisterPopover (state, { id }) {
+      state.popovers = omit(state.popovers, id)
+    }
+  },
+  actions: {
+    registerPopover (store, el) {
+      // Generate unique id, it will be used to link portal and portal-target
+      // popover-target will make portal targets for each registered popover
+      // el will be used by popover target to put popovers in their places.
+      let id = Math.floor(Math.random() * 1000000).toString()
+      store.commit('registerPopover', { id, el })
+      return id
+    },
+    unregisterPopover (store, id) {
+      store.commit('unregisterPopover', { id })
+    }
+  }
+}
+
+export default popover