lib/config, lib/model: Tweaks to the auto accept feature

Fix the folder restart behavior (ignore Label), improve the API for that
(imho).

Also removes the tab switch animation in the settings modal, because
annoying.

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/4577

lib/config/optionsconfiguration.go

@@ -10,6 +10,8 @@ import (
 	"encoding/json"
 	"encoding/xml"
 	"fmt"
+
+	"github.com/syncthing/syncthing/lib/util"
 )
 
 type WeakHashSelectionMethod int
@@ -162,3 +164,17 @@ func (orig OptionsConfiguration) Copy() OptionsConfiguration {
 	copy(c.UnackedNotificationIDs, orig.UnackedNotificationIDs)
 	return c
 }
+
+// RequiresRestartOnly returns a copy with only the attributes that require
+// restart on change.
+func (orig OptionsConfiguration) RequiresRestartOnly() OptionsConfiguration {
+	copy := orig
+	blank := OptionsConfiguration{}
+	util.CopyMatchingTag(&blank, &copy, "restart", func(v string) bool {
+		if len(v) > 0 && v != "true" {
+			panic(fmt.Sprintf(`unexpected tag value: %s. expected untagged or "true"`, v))
+		}
+		return v != "true"
+	})
+	return copy
+}