feat(webview2): hide the webview when the window is minimized (#702)

* feat(webview2): hide the webview when the window is minimized

* update covector readme

.changes/hide-webview-windows.md

@@ -0,0 +1,5 @@
+---
+"wry": "patch"
+---
+
+On Windows, hide the webview when the window is minimized to reduce memory and cpu usage.

.changes/readme.md

@@ -10,8 +10,7 @@ Use the following format:
 
 ```md
 ---
-"package-a": patch
-"package-b": minor
+"wry": patch
 ---
 
 Change summary goes here

src/webview/webview2/mod.rs

@@ -614,6 +614,14 @@ window.addEventListener('mousemove', (e) => window.chrome.webview.postMessage('_
             right: client_rect.right - client_rect.left,
             bottom: client_rect.bottom - client_rect.top,
           });
+
+          if wparam == WPARAM(win32wm::SIZE_MINIMIZED as _) {
+            let _ = (*controller).SetIsVisible(false);
+          }
+
+          if wparam == WPARAM(win32wm::SIZE_RESTORED as _) {
+            let _ = (*controller).SetIsVisible(true);
+          }
         }
 
         win32wm::WM_SETFOCUS | win32wm::WM_ENTERSIZEMOVE => {