Fixes wonky selection of item in search result (#90)

fixes #62

src/Main.elm

@@ -148,7 +148,10 @@ submitQuery old ( new, cmd ) =
             ( new, cmd )
 
 
-changeRouteTo : Model -> Url.Url -> ( Model, Cmd Msg )
+changeRouteTo :
+    Model
+    -> Url.Url
+    -> ( Model, Cmd Msg )
 changeRouteTo model url =
     let
         newModel =
@@ -178,12 +181,30 @@ changeRouteTo model url =
             ( newModel, Browser.Navigation.pushUrl newModel.navKey "/packages" )
 
         Just (Route.Packages channel query show from size) ->
-            Page.Packages.init channel query show from size
+            let
+                modelPage =
+                    case newModel.page of
+                        Packages x ->
+                            Just x
+
+                        _ ->
+                            Nothing
+            in
+            Page.Packages.init channel query show from size modelPage
                 |> updateWith Packages PackagesMsg newModel
                 |> submitQuery newModel
 
         Just (Route.Options channel query show from size) ->
-            Page.Options.init channel query show from size
+            let
+                modelPage =
+                    case newModel.page of
+                        Options x ->
+                            Just x
+
+                        _ ->
+                            Nothing
+            in
+            Page.Options.init channel query show from size modelPage
                 |> updateWith Options OptionsMsg newModel
                 |> submitQuery newModel
 

src/Page/Options.elm

@@ -69,6 +69,7 @@ init :
     -> Maybe String
     -> Maybe Int
     -> Maybe Int
+    -> Maybe Model
     -> ( Model, Cmd Msg )
 init =
     Search.init

src/Page/Packages.elm

@@ -106,6 +106,7 @@ init :
     -> Maybe String
     -> Maybe Int
     -> Maybe Int
+    -> Maybe Model
     -> ( Model, Cmd Msg )
 init =
     Search.init

src/Search.elm

@@ -99,14 +99,34 @@ init :
     -> Maybe String
     -> Maybe Int
     -> Maybe Int
+    -> Maybe (Model a)
     -> ( Model a, Cmd msg )
-init channel query show from size =
+init channel query show from size model =
-    ( { channel = Maybe.withDefault "unstable" channel
+    let
+        defaultChannel =
+            model
+                |> Maybe.map (\x -> x.channel)
+                |> Maybe.withDefault "unstable"
+
+        defaultFrom =
+            model
+                |> Maybe.map (\x -> x.from)
+                |> Maybe.withDefault 0
+
+        defaultSize =
+            model
+                |> Maybe.map (\x -> x.size)
+                |> Maybe.withDefault 15
+    in
+    ( { channel = Maybe.withDefault defaultChannel channel
       , query = query
-      , result = RemoteData.NotAsked
+      , result =
+            model
+                |> Maybe.map (\x -> x.result)
+                |> Maybe.withDefault RemoteData.NotAsked
       , show = show
-      , from = Maybe.withDefault 0 from
+      , from = Maybe.withDefault defaultFrom from
-      , size = Maybe.withDefault 15 size
+      , size = Maybe.withDefault defaultSize size
       }
     , Cmd.none
     )