feat(windows): Expose webview2 zoom hotkeys from wry

[Legend-Master]

Reference: #3310

[amrbashir]

Just a few documentation nitpicks. You will need to regenerate the schema file.

[lucasfernog]

Can we use WebView::zoom to manually implement this feature on macOS/Linux?

[amrbashir]

This PR is for only allowing users to enable the builtin one on Webview2, we need another PR to expose WebView::zoom and users can create a UI for it themselves.

[amrbashir]

hmm actually this doesn't enable any UI, just the hotkeys, maybe we can indeed emulate the behavior on other platforms and also expose WebView::zoom at the same time

@Legend-Master would you like to add that too in this PR?

[Legend-Master]

I think it's fine to expose the webview2 one first in this pr (it's in the webview2 api but we don't have a way to use it), and expose zoom function and polyfill for this functionality in another pr

If we want to put them in a single pr, I can take a look tomorrow, but I'm not familiar with WebKit zoom controls (is it the same as Chromium?)

And emulating it would be injecting some JavaScript to the webview?

[amrbashir]

If we want to put them in a single pr, I can take a look tomorrow

let's make them in another PR.

but I'm not familiar with WebKit zoom controls (is it the same as Chromium?)

Yeah should be the same keys, ctrl +/-.

And emulating it would be injecting some JavaScript to the webview?

yeah, take a look at https://github.com/tauri-apps/tauri/blob/36b4c12497fbe636066f4848c6877b3ab6cc892e/core/tauri/src/webview/scripts/toggle-devtools.js

[Legend-Master]

Seems like webview2's zoom popup is disabled without a way to getting it back MicrosoftEdge/WebView2Feedback#95 (comment), also the zoom factor is not persisted across page load (reset to 100% on reload/restart), pretty sad that webview2's zoom control is a downgraded version of the browser zoom control 😥

I'll take a look at exposing zoom function now