Fix grid filter bug when switching from 'equal' to 'between' verbs

and vice versa

tailbone/static/js/tailbone.buefy.grid.js

@@ -28,6 +28,17 @@ const GridFilterNumericValue = {
             this.startValue = this.value
         }
     },
+    watch: {
+        // when changing from e.g. 'equal' to 'between' filter verbs,
+        // must proclaim new filter value, to reflect (lack of) range
+        wantsRange(val) {
+            if (val) {
+                this.$emit('input', this.startValue + '|' + this.endValue)
+            } else {
+                this.$emit('input', this.startValue)
+            }
+        },
+    },
     methods: {
         focus() {
             this.$refs.startValue.focus()