Very first pass at contextual search. This _should_ end up as a submenu

with searches for "Same recipient", "In this conversations", "On this
date", etc.

res/menu/message_list_context.xml

@@ -49,4 +49,8 @@
 		android:id="@+id/send_alternate"
 		android:title="@string/send_alternate_action"
 	/>
+    <item
+        android:id="@+id/same_sender"
+        android:title="@string/from_same_sender"
+    />
 </menu>

res/values/strings.xml

@@ -275,6 +275,9 @@ Welcome to K-9 Mail setup.  K-9 is an open source mail client for Android origin
     
     <string name="folder_push_active_symbol">(Push)</string>
 
+    <string name="find_action">Find messages</string>
+    <string name="from_same_sender">More from this sender</string>
+
     <string name="message_copied_toast">Message copied</string>
     <string name="message_moved_toast">Message moved</string>
     <string name="message_deleted_toast">Message deleted</string>

src/com/fsck/k9/activity/MessageList.java

@@ -1429,6 +1429,13 @@ public class MessageList
 
                 break;
 
+            case R.id.same_sender:
+                                MessageList.actionHandle(MessageList.this,
+                                         "From "+holder.sender, holder.sender, true,
+                                         null, null);
+
+                break;
+
         }
 
         return super.onContextItemSelected(item);