[vcs-log] minor: toString for requests

platform/vcs-log/impl/src/com/intellij/vcs/log/data/VcsLogFiltererImpl.java

@@ -234,6 +234,10 @@ public class VcsLogFiltererImpl implements VcsLogFilterer {
   }
 
   private static final class RefreshRequest implements Request {
+    @Override
+    public String toString() {
+      return "RefreshRequest";
+    }
   }
 
   private static final class ValidateRequest implements Request {
@@ -242,6 +246,11 @@ public class VcsLogFiltererImpl implements VcsLogFilterer {
     private ValidateRequest(boolean validate) {
       this.validate = validate;
     }
+
+    @Override
+    public String toString() {
+      return "ValidateRequest " + validate;
+    }
   }
 
   private static final class FilterRequest implements Request {
@@ -250,6 +259,11 @@ public class VcsLogFiltererImpl implements VcsLogFilterer {
     FilterRequest(VcsLogFilterCollection filters) {
       this.filters = filters;
     }
+
+    @Override
+    public String toString() {
+      return "FilterRequest by " + filters;
+    }
   }
 
   private static final class SortTypeRequest implements Request {
@@ -258,6 +272,11 @@ public class VcsLogFiltererImpl implements VcsLogFilterer {
     SortTypeRequest(PermanentGraph.SortType sortType) {
       this.sortType = sortType;
     }
+
+    @Override
+    public String toString() {
+      return "SortTypeRequest " + sortType;
+    }
   }
 
   private static final class MoreCommitsRequest implements Request {