fix(style): Fix regressions introduced by #2338 (#2345)

Put Column Slim Back Button classnames in order so it is positioned right and top. Add icon button style back to privacy dropdown and upload buttons so they are positioned correctly and do not wiggle. Remove abstracted style from CSS. Add missed class for the upload form thumbnail. Add the missed styles for upload form thumnail. Alphabetize styles for column-back-button. Fix fontSize typo for media-spoiler-video-play-icon.

app/assets/javascripts/components/components/column_back_button_slim.jsx

@@ -15,7 +15,7 @@ class ColumnBackButtonSlim extends React.PureComponent {
   render () {
     return (
       <div className='column-back-button--slim'>
-        <div className='column-back-button--slim-button' role='button' tabIndex='0' onClick={this.handleClick} className='column-back-button'>
+        <div role='button' tabIndex='0' onClick={this.handleClick} className='column-back-button column-back-button--slim-button'>
           <i className='fa fa-fw fa-chevron-left column-back-button__icon' />
           <FormattedMessage id='column_back_button.label' defaultMessage='Back' />
         </div>

app/assets/javascripts/components/features/compose/components/privacy_dropdown.jsx

@@ -14,6 +14,11 @@ const messages = defineMessages({
   change_privacy: { id: 'privacy.change', defaultMessage: 'Adjust status privacy' }
 });
 
+const iconStyle = {
+  height: null,
+  lineHeight: '27px'
+}
+
 class PrivacyDropdown extends React.PureComponent {
 
   constructor (props, context) {
@@ -72,7 +77,7 @@ class PrivacyDropdown extends React.PureComponent {
 
     return (
       <div ref={this.setRef} className={`privacy-dropdown ${open ? 'active' : ''}`}>
-        <div className='privacy-dropdown__value'><IconButton className='privacy-dropdown__value-icon' icon={valueOption.icon} title={intl.formatMessage(messages.change_privacy)} size={18} active={open} inverted onClick={this.handleToggle} /></div>
+        <div className='privacy-dropdown__value'><IconButton className='privacy-dropdown__value-icon' icon={valueOption.icon} title={intl.formatMessage(messages.change_privacy)} size={18} active={open} inverted onClick={this.handleToggle} style={iconStyle}/></div>
         <div className='privacy-dropdown__dropdown'>
           {options.map(item =>
             <div role='button' tabIndex='0' key={item.value} onClick={this.handleClick.bind(this, item.value)} className={`privacy-dropdown__option ${item.value === value ? 'active' : ''}`}>

app/assets/javascripts/components/features/compose/components/upload_button.jsx

@@ -6,6 +6,12 @@ const messages = defineMessages({
   upload: { id: 'upload_button.label', defaultMessage: 'Add media' }
 });
 
+
+const iconStyle = {
+  height: null,
+  lineHeight: '27px'
+}
+
 class UploadButton extends React.PureComponent {
 
   constructor (props, context) {
@@ -30,11 +36,12 @@ class UploadButton extends React.PureComponent {
   }
 
   render () {
+
     const { intl, resetFileKey, disabled } = this.props;
 
     return (
       <div className='compose-form__upload-button'>
-        <IconButton icon='camera' title={intl.formatMessage(messages.upload)} disabled={disabled} onClick={this.handleClick} className='compose-form__upload-button-icon' size={18} inverted />
+        <IconButton icon='camera' title={intl.formatMessage(messages.upload)} disabled={disabled} onClick={this.handleClick} className='compose-form__upload-button-icon' size={18} inverted style={iconStyle}/>
         <input key={resetFileKey} ref={this.setRef} type='file' multiple={false} onChange={this.handleChange} disabled={disabled} style={{ display: 'none' }} />
       </div>
     );

app/assets/javascripts/components/features/compose/components/upload_form.jsx

@@ -18,7 +18,7 @@ class UploadForm extends React.PureComponent {
       <div className='compose-form__upload' key={attachment.get('id')}>
         <Motion defaultStyle={{ scale: 0.8 }} style={{ scale: spring(1, { stiffness: 180, damping: 12 }) }}>
           {({ scale }) =>
-            <div style={{ transform: `translateZ(0) scale(${scale})`, background: `url(${attachment.get('preview_url')}) no-repeat center` }}>
+            <div className='compose-form__upload-thumbnail' style={{ transform: `translateZ(0) scale(${scale})`, background: `url(${attachment.get('preview_url')}) no-repeat center` }}>
               <IconButton icon='times' title={intl.formatMessage(messages.undo)} size={36} onClick={this.props.onRemoveFile.bind(this, attachment.get('id'))} />
             </div>
           }

app/assets/stylesheets/components.scss

@@ -261,6 +261,12 @@
   margin: 5px;
 }
 
+.compose-form__upload-thumbnail {
+  border-radius: 4px;
+  height: 100px;
+  width: 100%;
+}
+
 .compose-form__upload-cancel {
   background-size: cover;
   border-radius: 4px;
@@ -1347,12 +1353,12 @@ a.status__content__spoiler-link {
 }
 
 .column-back-button {
-  padding: 15px;
-  font-size: 16px;
   background: lighten($color1, 4%);
-  flex: 0 0 auto;
-  cursor: pointer;
   color: $color4;
+  cursor: pointer;
+  flex: 0 0 auto;
+  font-size: 16px;
+  padding: 15px;
   z-index: 3;
 
   &:hover {
@@ -2375,10 +2381,6 @@ button.icon-button.active i.fa-retweet {
     box-shadow: 0 -4px 4px rgba($color8, 0.1);
   }
 
-  .privacy-dropdown__value-icon {
-    line-height: 27px;
-  }
-
   .privacy-dropdown__dropdown {
     display: block;
     box-shadow: 2px 4px 6px rgba($color8, 0.1);
@@ -3061,7 +3063,7 @@ button.icon-button.active i.fa-retweet {
 .media-spoiler-video-play-icon {
   border-radius: 100px;
   color: rgba(255, 255, 255, 0.8);
-  fontSize: 36px;
+  font-size: 36px;
   padding: 5px;
   position: absolute;
   top: 50%;