Adding explanatory comments

Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

src/renderer/components/dialog/dialog.tsx

@@ -92,6 +92,7 @@ export class Dialog extends React.PureComponent<DialogProps, DialogState> {
     this.props.onOpen();
     if (!this.props.pinned) {
       if (this.elem) this.elem.addEventListener('click', this.onClickOutside);
+      // Using document.body target to handle keydown event before Drawer does
       document.body.addEventListener('keydown', this.onEscapeKey);
     }
   }

src/renderer/components/drawer/drawer.tsx

@@ -40,6 +40,7 @@ export class Drawer extends React.Component<DrawerProps> {
   });
 
   componentDidMount() {
+    // Using window target for events to make sure they will be catched after other places (e.g. Dialog)
     window.addEventListener("mousedown", this.onMouseDown)
     window.addEventListener("click", this.onClickOutside)
     window.addEventListener("keydown", this.onEscapeKey)