Add known issue and change description in readme

Author: awulkiew

CHANGELOG.md

@@ -5,6 +5,8 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
+### Known issues
+- The visualization is not shown after hiding the webview with another window and showing it again
 
 ## [0.3.0]
 ### Added

README.md

@@ -53,4 +53,4 @@ This extension allows to display graphical representation of variables during de
 #### Known issues
 
 * The extension doesn't work for C++ variables defined with `typedef` with GDB, including classes defining member types, e.g. Boost.Geometry `polygon`. This issue [is known](https://github.com/microsoft/vscode-cpptools/issues/3038) and also affects the use of natvis files. If [this proposal](https://github.com/microsoft/MIEngine/issues/1236) was implemented it could potentially allow to work around this issue.
-* Geographic polygons with holes are visualized incorrectly if an interior ring is in the viewport and the whole exterior ring is outside. This is a side effect of a workaround for an [issue in Plotly](https://github.com/plotly/plotly.js/issues/6044) which doesn't support geographic polygons with holes.
+* Holes of geographic polygons may be visualized incorrectly. This is a side effect of a workaround for an [issue in Plotly](https://github.com/plotly/plotly.js/issues/6044) which doesn't support geographic polygons with holes.

src/webview.ts

@@ -21,6 +21,12 @@ export class Webview {
 					enableScripts: true,
 					localResourceRoots: [vscode.Uri.file(path.join(this._context.extensionPath, 'resources'))]
 				});
+			// this._panel.onDidChangeViewState(
+			// 	(e) => {
+			// 		// TODO: handle hiding and showing again here?
+			// 	},
+			// 	null,
+			// 	this._context.subscriptions);
 			this._panel.onDidDispose(
 				() => {
 					this._panel = undefined;