[ivette] ASTview: fixes marker hover when the mouse leaves the AST view.

ivette/src/dome/renderer/text/editors.tsx

@@ -484,6 +484,7 @@ class CodeMirrorWrapper extends React.Component<TextProps> {
         onFocus={this.onFocus}
         onScroll={this.onScroll}
         onMouseMove={this.onMouseMove}
+        onMouseLeave={this.onMouseMove}
       />
     );
   }