use an 'AsyncButton' that waits for completion of an async onClick handler for mail replies and comments in tickets

web/src/components/Timeline.vue

@@ -40,10 +40,10 @@
                 <div class="">
                     <textarea placeholder="add comment..." v-model="newComment" class="form-control">
                     </textarea>
-                    <button class="btn btn-primary float-right" @click="addCommentAndClear">
+                    <AsyncButton class="btn btn-primary float-right" :task="addCommentAndClear">
                         <font-awesome-icon icon="comment"/>
                         Save Comment
-                    </button>
+                    </AsyncButton>
                 </div>
             </div>
         </li>
@@ -58,10 +58,10 @@
                 <div>
                     <textarea placeholder="reply mail..." v-model="newMail" class="form-control">
                     </textarea>
-                    <button class="btn btn-primary float-right" @click="sendMailAndClear">
+                    <AsyncButton class="btn btn-primary float-right" :task="sendMailAndClear">
                         <font-awesome-icon icon="envelope"/>
                         Send Mail
-                    </button>
+                    </AsyncButton>
                 </div>
             </div>
         </li>
@@ -77,11 +77,12 @@ import {mapActions, mapGetters} from "vuex";
 import TimelineAssignment from "@/components/TimelineAssignment.vue";
 import TimelineRelatedItem from "@/components/TimelineRelatedItem.vue";
 import TimelineShippingVoucher from "@/components/TimelineShippingVoucher.vue";
+import AsyncButton from "@/components/inputs/AsyncButton.vue";
 
 export default {
     name: 'Timeline',
     components: {
-        TimelineShippingVoucher,
+        TimelineShippingVoucher, AsyncButton,
         TimelineRelatedItem, TimelineAssignment, TimelineStateChange, TimelineComment, TimelineMail
     },
     props: {

web/src/components/inputs/AsyncButton.vue

@@ -0,0 +1,47 @@
+<template>
+    <button @click.stop="handleClick" :disabled="disabled">
+        <span class="spinner-border spinner-border-sm" role="status" aria-hidden="true"
+              :class="{'d-none': !disabled}"></span>
+        <span class="ml-2" :class="{'d-none': !disabled}">In Progress...</span>
+        <span :class="{'d-none': disabled}"><slot></slot></span>
+    </button>
+</template>
+
+<script>
+
+export default {
+    name: 'AsyncButton',
+    data() {
+        return {
+            disabled: false,
+        };
+    },
+    props: {
+        task: {
+            type: Function,
+            required: true,
+        },
+    },
+    methods: {
+        async handleClick() {
+            console.log("AsyncButton.handleClick() called");
+            if (this.task && typeof this.task === 'function') {
+                this.disabled = true;
+                try {
+                    await this.task();
+                } catch (e) {
+                    console.error(e);
+                } finally {
+                    this.disabled = false;
+                }
+            }
+        },
+    }
+};
+</script>
+
+<style scoped>
+.spinner-border {
+    vertical-align: -0.125em;
+}
+</style>