Fix #4731: Tag counter in edit boxes should only count unique tags, not repeated.

Just use the `uniq` function from lodash. Adds ~1kb to the build.

Also rename `Utility.regexp_split` to `Utility.splitWords`.

package.json

@@ -2,6 +2,14 @@
   "license": "MIT",
   "dependencies": {
     "@babel/plugin-proposal-decorators": "^7.10.5",
+    "@fontsource/anton": "^4.0.0",
+    "@fontsource/archivo-narrow": "^4.0.0",
+    "@fontsource/ibm-plex-mono": "^4.0.0",
+    "@fontsource/indie-flower": "^4.0.0",
+    "@fontsource/lora": "^4.0.0",
+    "@fontsource/petit-formal-script": "^4.0.0",
+    "@fontsource/rokkitt": "^4.0.0",
+    "@fontsource/unifrakturmaguntia": "^4.0.0",
     "@fortawesome/fontawesome-free": "^5.11.2",
     "@rails/ujs": "^6.0.2-1",
     "@rails/webpacker": "^6.0.0-beta.4",
@@ -11,6 +19,7 @@
     "jquery": "3.5.1",
     "jquery-hotkeys": "^0.2.2",
     "jquery-ui": "^1.12.1",
+    "lodash": "^4.17.21",
     "mini-css-extract-plugin": "^1.3.4",
     "postcss": "^8.2.4",
     "postcss-flexbugs-fixes": "^5.0.2",
@@ -22,14 +31,6 @@
     "sass-loader": "^11.0.0",
     "spark-md5": "^3.0.0",
     "tippy.js": "^6.2.3",
-    "@fontsource/anton": "^4.0.0",
-    "@fontsource/archivo-narrow": "^4.0.0",
-    "@fontsource/ibm-plex-mono": "^4.0.0",
-    "@fontsource/indie-flower": "^4.0.0",
-    "@fontsource/lora": "^4.0.0",
-    "@fontsource/petit-formal-script": "^4.0.0",
-    "@fontsource/rokkitt": "^4.0.0",
-    "@fontsource/unifrakturmaguntia": "^4.0.0",
     "typopro-web": "^4.2.2",
     "webpack": "^5.11.0",
     "webpack-cli": "^4.2.0"