[tree] Problem when moving nodes

* Issue #308

dist/styles/sass.css

@@ -535,6 +535,11 @@ li .leaf:hover a.settings {
   color: black;
 }
 
+.forest-tree-node-action-move {
+  max-height: 50vh;
+  overflow-y: scroll;
+}
+
 .forest-layout {
   background-color: #fff;
   position: fixed;

dist/styles/sass.css.map

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\ No newline at end of file
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\ No newline at end of file

src/Gargantext/Components/Forest/Tree/Node/Action/Move.purs

@@ -38,7 +38,12 @@ moveNodeCpt = here.component "moveNode" cpt
                 Nothing -> H.div {} []
               _                   -> H.div {} []
 
-      pure $ panel [ subTreeView { action
+      pure $
+
+        H.div
+        { className: "forest-tree-node-action-move" }
+        [
+          panel [ subTreeView { action
                                  , dispatch
                                  , handed
                                  , id
@@ -47,3 +52,4 @@ moveNodeCpt = here.component "moveNode" cpt
                                  , subTreeParams
                                  } []
               ] button
+        ]

src/sass/_tree.sass

@@ -168,6 +168,11 @@ li
   .ok-to-use
     color: black
 
+.forest-tree-node-action-move
+  // empirical value (see issue #308)
+  max-height: 50vh
+  overflow-y: scroll
+
 .forest-layout
   background-color: #fff
   position: fixed