Select first record when refreshing attachment preview

Since ab82d479eca1 no record is set when displaying screen.

Closes #12756
(grafted from e40c63e467b0f878b54594729c7e07458f12ad71)

--HG--
branch : 7.0

sao/src/tab.js

@@ -1309,7 +1309,13 @@
             if (!Sao.common.compare(this.attachment_screen.domain, domain) ||
                 force) {
                 this.attachment_screen.domain = domain;
-                this.attachment_screen.search_filter();
+                this.attachment_screen.search_filter().then(() => {
+                    const group = this.attachment_screen.group;
+                    if (group.length) {
+                        this.attachment_screen.current_record = group[0];
+                        this.attachment_screen.display();
+                    }
+                });
             }
         },
         note: function() {

tryton/tryton/gui/window/form.py

@@ -240,6 +240,10 @@ class Form(TabContent):
         if self.attachment_screen.domain != domain or force:
             self.attachment_screen.domain = domain
             self.attachment_screen.search_filter()
+            group = self.attachment_screen.group
+            if group:
+                self.attachment_screen.current_record = group[0]
+                self.attachment_screen.display()
 
     def sig_note(self, widget=None):
         record = self.screen.current_record