Fix checkbox selection for trees (#3719)

* fix tree checkbox selection

* update changelog

Author: philippotto

CHANGELOG.md

@@ -46,7 +46,7 @@ For upgrade instructions, please check the [migration guide](MIGRATIONS.md).
 - Fixed a bug where saving tracings failed after they were open for >24h. [#3633](https://github.com/scalableminds/webknossos/pull/3633)
 - Fixed a bug that resulted in slow data loading when moving quickly through a dataset. [#3656](https://github.com/scalableminds/webknossos/pull/3656)
 - Fixed a bug which caused the wrong magnification to be rendered when zooming out very far. [#3641](https://github.com/scalableminds/webknossos/pull/3641)
-
+- Fixed a bug which broke the functionality to toggle the visibility of a tree in a skeleton tracing. [#3719](https://github.com/scalableminds/webknossos/pull/3719)
 
 ## [19.01.0](https://github.com/scalableminds/webknossos/releases/tag/19.01.0) - 2019-01-14
 [Commits](https://github.com/scalableminds/webknossos/compare/18.12.0...19.01.0)

app/assets/javascripts/oxalis/view/right-menu/tree_hierarchy_view.js

@@ -126,7 +126,8 @@ class TreeHierarchyView extends React.PureComponent<Props, State> {
   };
 
   onCheck = (evt: SyntheticMouseEvent<*>) => {
-    const { id, type } = evt.currentTarget.node;
+    // $FlowFixMe .node is unknown to flow
+    const { id, type } = evt.target.node;
     if (type === TYPE_TREE) {
       this.props.onToggleTree(parseInt(id, 10));
     } else if (id === MISSING_GROUP_ID) {
@@ -137,7 +138,8 @@ class TreeHierarchyView extends React.PureComponent<Props, State> {
   };
 
   onSelectTree = (evt: SyntheticMouseEvent<*>) => {
-    const treeId = parseInt(evt.currentTarget.dataset.id, 10);
+    // $FlowFixMe .dataset is unknown to flow
+    const treeId = parseInt(evt.target.dataset.id, 10);
     if (evt.ctrlKey) {
       this.props.onSelectTree(treeId);
     } else {
@@ -147,7 +149,8 @@ class TreeHierarchyView extends React.PureComponent<Props, State> {
   };
 
   onSelectGroup = (evt: SyntheticMouseEvent<*>) => {
-    const groupId = parseInt(evt.currentTarget.dataset.id, 10);
+    // $FlowFixMe .dataset is unknown to flow
+    const groupId = parseInt(evt.target.dataset.id, 10);
     const numberOfSelectedTrees = this.props.selectedTrees.length;
     const selectGroup = () => {
       this.props.deselectAllTrees();