CapturePreview completion handler only fires when webview visible

[dd8]

Description
CapturePreview returns S_OK but never calls the CapturePreviewCompletedHandler if:

a) put_IsVisible( FALSE ) has been called on the controller; or
b) WS_VISIBLE wasn't specified on the parent hWnd passed to CreateCoreWebViewController

This causes problems in headless use cases. Workaround is moving window offscreen but this can cause issues with accessibility tools like screen readers.

Version
SDK: 1.0.622.22
Runtime: Release runtime 86.0.622.51
Framework: Win32
OS: Win10 version 1909

Repro Steps

1. Run WebView2APISample
2. Choose Toggle Visibility from View menu to hide web view
3. Choose Save Screenshot from File menu - the Save As dialog appears but the Preview Captured message box doesn't appear
4. Wait a couple of minutes then choose Toggle Visibility from View menu to show the web view
5. The CapturePreviewCompletedHandler now fires and the Preview Captured message box appears

AB#29999309

[pagoe-msft]

@dd8

Thanks for raising this issue, I've filed a bug for us to investigate.

[danielvandenberg95]

Issue also occurs when creating a window with HWND_MESSAGE as parent.