feat: multiple select2 widget (#1272)

Author: lukasvinclav

src/unfold/widgets.py

@@ -695,6 +695,31 @@ def __init__(self, attrs=None, choices=()):
         super().__init__(attrs, choices)
 
 
+class UnfoldAdminSelect2MultipleWidget(SelectMultiple):
+    def __init__(self, attrs=None, choices=()):
+        if attrs is None:
+            attrs = {}
+
+        attrs["data-theme"] = "admin-autocomplete"
+        attrs["class"] = "unfold-admin-autocomplete admin-autocomplete"
+
+        super().__init__(attrs, choices)
+
+    class Media:
+        js = (
+            "admin/js/vendor/jquery/jquery.js",
+            "admin/js/vendor/select2/select2.full.js",
+            "admin/js/jquery.init.js",
+            "unfold/js/select2.init.js",
+        )
+        css = {
+            "screen": (
+                "admin/css/vendor/select2/select2.css",
+                "admin/css/autocomplete.css",
+            ),
+        }
+
+
 class UnfoldAdminRadioSelectWidget(AdminRadioSelect):
     template_name = "unfold/widgets/radio.html"
     option_template_name = "unfold/widgets/radio_option.html"