diff --git a/src/Constraint.elm b/src/Constraint.elm
index d7cf12e..32bb1ba 100644
--- a/src/Constraint.elm
+++ b/src/Constraint.elm
@@ -1,4 +1,4 @@
-module Constraint exposing (Model, init, positions)
+module Constraint exposing (Model, init, positions, updateAttachments)
 
 import Dict exposing (Dict)
 
@@ -50,7 +50,7 @@ solveWithoutFocus (Model guts) =
                                     Dict.get id guts.heights
                                         |> Maybe.withDefault 0
                             in
-                            if Debug.log "ideal position" idealPosition >= Debug.log "progress line" progressLine then
+                            if idealPosition >= progressLine then
                                 ( Dict.insert id idealPosition finalPositions
                                 , idealPosition + height + guts.margin
                                 )
@@ -65,6 +65,15 @@ solveWithoutFocus (Model guts) =
         }
 
 
+updateAttachments : Dict Int Float -> Model -> Model
+updateAttachments attachments (Model guts) =
+    if attachments == guts.attachments then
+        Model guts
+
+    else
+        Model { guts | attachments = attachments } |> solveWithoutFocus
+
+
 positions : Model -> Dict Int Float
 positions (Model guts) =
     guts.positions
diff --git a/src/Main.elm b/src/Main.elm
index 2bd7eb1..4698292 100644
--- a/src/Main.elm
+++ b/src/Main.elm
@@ -88,8 +88,15 @@ update msg model =
                 Nothing ->
                     ( model, Cmd.none )
 
-        AttachmentsMoved tops ->
-            ( model, Cmd.none )
+        AttachmentsMoved attachments ->
+            ( { model
+                | commentPositions =
+                    Maybe.map
+                        (Constraint.updateAttachments (finalAttachments attachments))
+                        model.commentPositions
+              }
+            , Cmd.none
+            )
 
         SetUpCommentConstraints ( attachments, commentHeights ) ->
             ( { model
@@ -97,22 +104,7 @@ update msg model =
                     Just <|
                         Constraint.init
                             { heights = Dict.fromList commentHeights
-                            , attachments =
-                                List.foldl
-                                    (\( commentId, top ) soFar ->
-                                        Dict.update commentId
-                                            (\current ->
-                                                case current of
-                                                    Nothing ->
-                                                        Just top
-
-                                                    Just otherTop ->
-                                                        Just (min top otherTop)
-                                            )
-                                            soFar
-                                    )
-                                    Dict.empty
-                                    attachments
+                            , attachments = finalAttachments attachments
                             , margin = 10
                             }
               }
@@ -120,6 +112,24 @@ update msg model =
             )
 
 
+finalAttachments : List ( Int, Float ) -> Dict Int Float
+finalAttachments =
+    List.foldl
+        (\( commentId, top ) soFar ->
+            Dict.update commentId
+                (\current ->
+                    case current of
+                        Nothing ->
+                            Just top
+
+                        Just otherTop ->
+                            Just (min top otherTop)
+                )
+                soFar
+        )
+        Dict.empty
+
+
 findNewAttachmentTopsTask : List Attachment -> Task Never (List ( Int, Float ))
 findNewAttachmentTopsTask attachments =
     -- TODO: this may need Process.sleep 0 to be accurate in all cases