Auto-select text when editing costs for receiving

tailbone/templates/receiving/view.mako

@@ -103,6 +103,7 @@
                    ref="input"
                    v-show="editing"
                    @keydown.native="inputKeyDown"
+                   @focus="selectAll"
                    @blur="inputBlur"
                    style="width: 6rem;">
           </b-input>
@@ -189,6 +190,12 @@
             },
             methods: {
 
+                selectAll() {
+                    // nb. must traverse into the <b-input> element
+                    let trueInput = this.$refs.input.$el.firstChild
+                    trueInput.select()
+                },
+
                 startEdit() {
                     this.inputValue = this.value
                     this.editing = true