Refactor <dougal-project-settings-binning/>

lib/www/client/source/src/components/project-settings/geodetics.vue

@@ -9,7 +9,7 @@
           hint="EPSG code of the project's coordinate reference system"
           persistent-hint
           type="number"
-          v-model.number="epsg"
+          v-model.number="epsg_"
         >
         </v-text-field>
       </v-form>
@@ -38,30 +38,30 @@
 export default {
   name: "DougalProjectSettingsGeodetics",
 
-  props: [ "value" ],
+  props: [ "epsg" ],
 
   data () {
     return {
-      epsg: null
+      epsg_: null
     }
   },
 
   watch: {
-    value (newValue) {
-      this.reset();
+    epsg () {
+      if (this.epsg != this.epsg_) {
+        this.epsg_ = this.epsg;
+      }
     }
   },
 
   methods: {
 
     reset () {
-      for (const key of Object.keys(this.$data)) {
-        this[key] = this.value[key];
-      }
+      this.epsg_ = this.epsg;
     },
 
     save () {
-      this.$emit('input', {...this.$data});
+      this.$emit('input', {epsg: this.epsg_});
     },
 
     back () {