Set sao's multiselection widget height according to its content

sao/src/sao.less

@@ -1131,6 +1131,13 @@ img.icon {
             content: "☑ ";
         }
     }
+
+    &.yexpand {
+        select {
+            min-height: 150px;
+            max-height: 400px;
+        }
+    }
 }
 
 .form-integer, .form-float, .form-timedelta,
@@ -1250,6 +1257,13 @@ input.column-boolean {
     }
 }
 
+.filter-window {
+    select[multiple] {
+        min-height: 150px;
+        max-height: 400px;
+    }
+}
+
 @media screen and (max-width: @screen-xs-max) {
     .form-dict-container {
         grid-template-columns: 100%;

sao/src/screen.js

@@ -454,6 +454,7 @@
                 this.search_modal = dialog.modal;
                 this.search_form = dialog.content;
                 this.search_form.addClass('form-horizontal');
+                this.search_form.addClass('filter-window');
                 this.search_form.submit(function(e) {
                     e.preventDefault();
                     search();
@@ -503,6 +504,7 @@
                             entry = new Sao.ScreenContainer.Selection(
                                     field.selection, prefix + field.name);
                             input = entry.el;
+                            input.prop('size', field.selection.length);
                             break;
                         case 'date':
                             format = Sao.common.date_format(

sao/src/view/form.js

@@ -4716,13 +4716,7 @@ function eval_pyson(value){
             var record = this.record;
             var field = this.field;
             this.update_selection(record, field, () => {
-                var yexpand = this.attributes.yexpand;
-                if (yexpand === undefined) {
-                    yexpand = this.expand;
-                }
-                if (!yexpand) {
-                    this.select.prop('size', this.select.children().length);
-                }
+                this.select.prop('size', this.select.children().length);
                 if (!field) {
                     return;
                 }