[Problem/Bug]: External File Drags are blocked while a modal dialog is open

What happened?

If a modal dialog is open, in my case a file selector, I don't get any drag events in the web layer when dragging a file into the window, either from the modal file selector itself, or my desktop/an explorer.exe window.

This is allowed in Electron, so this feature reduction could interfere with some users workflows.

Importance

Moderate. My app's user experience is affected, but still usable.

Runtime Channel

Stable release (WebView2 Runtime)

Runtime Version

135.0.3179.54

SDK Version

3116.0

Framework

Winforms

Operating System

Windows 11

OS Version

26100.3476

Repro steps

Using the WebView2WindowsFormsBrowser example, add:

window.addEventListener("dragenter", e => { alert("Drag Detected!") }); document.getElementById("openFile").addEventListener("click", e => { window.showOpenFilePicker(); })
to AppStartPage.js, and add:
<button id="openFile">Open File Selector</button>
to AppStartPage.html.

Then run the solution, click the "Open File Selector" button, and attempt to drag a file into the window and you won't see an alert.

Repros in Edge Browser

No, issue does not reproduce in the corresponding Edge version

Regression

Don't know

Last working version (if regression)

No response

Start with the WebView2WindowsFormsBrowser example and the repro changes to AppStartPage.js and AppStartPage.html. Reproduce the missing dragenter event while showOpenFilePicker() is open, then trace the WebView2 Windows Forms behavior around modal dialogs and external file drags. Done means the web layer receives the expected drag event in this scenario without regressing normal modal-dialog behavior.