fix(field): prevent input size changes when showing clear icon

Refs: #5338

front/core/components/autocomplete/style.scss

@@ -19,6 +19,10 @@
                 padding-right: 0;
             }
         }
+
+        & > .icons.pre {
+            min-width: 22px
+        }
     }
     &.readonly > .container > .icons.post {
         display: none;

front/core/components/field/index.html

@@ -12,7 +12,7 @@
             <span class="required">*</span>
         </label> 
     </div>
-    <div class="icons pre">
+    <div class="icons pre" ng-class="{'clearable': $ctrl.clearDisabled != true}">
         <vn-icon ng-show="::$ctrl.clearDisabled != true"
             icon="clear"
             translate-attr="{title: 'Clear'}"

front/core/components/field/style.scss

@@ -151,6 +151,9 @@
                 display: none;
             }
         }
+        & > .icons.pre.clearable {
+            min-width: 22px
+        }
         & > .underline {
             position: absolute;
             bottom: 0;