better approach

src/components/post_status_form/post_status_form.js

@@ -28,6 +28,10 @@ const PostStatusForm = {
   components: {
     MediaUpload
   },
+  mounted () {
+    console.log(this.$refs)
+    this.resize(this.$refs.textarea)
+  },
   data () {
     let statusText = ''
 
@@ -235,10 +239,11 @@ const PostStatusForm = {
       e.dataTransfer.dropEffect = 'copy'
     },
     resize (e) {
-      e.target.style.height = 'auto'
-      e.target.style.height = `${e.target.scrollHeight - 10}px`
-      if (e.target.value === '') {
-        e.target.style.height = '16px'
+      const target = e.target || e
+      target.style.height = 'auto'
+      target.style.height = `${target.scrollHeight - 10}px`
+      if (target.value === '') {
+        target.style.height = '16px'
       }
     },
     clearError () {

src/components/post_status_form/post_status_form.vue

@@ -3,6 +3,7 @@
   <form @submit.prevent="postStatus(newStatus)">
     <div class="form-group" >
       <textarea
+        ref="textarea"
         @click="setCaret"
         @keyup="setCaret" v-model="newStatus.status" :placeholder="$t('post_status.default')" rows="1" class="form-control"
         @keydown.down="cycleForward"
@@ -15,7 +16,6 @@
         @drop="fileDrop"
         @dragover.prevent="fileDrag"
         @input="resize"
-        @focus="resize"
         @paste="paste">
       </textarea>
     </div>