Expose `focus()` to Window

[probablykasper]

Is your feature request related to a problem? Please describe.
Calling win.show() in the frontend does not bring the window (or at least not the app) to focus

Describe the solution you'd like
Electron handles this by having win.show() and win.showInactive(). I would personally prefer win.show(focus: true)

[amrbashir]

what is your OS info ?

[probablykasper]

macOS 10.14.6

[amrbashir]

On linux: we can use present_with_time() https://gtk-rs.org/docs/gtk/trait.GtkWindowExt.html#tymethod.present_with_time

On windows: there is a lot of functions to try and maybe combine them SetForegroundWindow, SetActiveWindow and SetFocus.

On Macos: google search reveals this [NSWindow makeKeyAndOrderFront: nil]; https://discourse.libcinder.org/t/how-to-bring-a-window-to-foreground-and-or-have-focus/1176/4

[lemarier]

We should check if it’s related to tauri-apps/wry#184

[wusyong]

Closed by tauri-apps/wry#220

[probablykasper]

@wusyong What's the intended solution in tauri-apps/wry#220? Assuming it's supposed to make appWindow.show() focus the window, it doesn't seem to be doing it (tested on latest tauri commit 935db26)

[lemarier]

We should expose focus to the Window. When window is already open, but hidden behind other windows, calling focus should bring the window at the top.

[lemarier]

Related to tauri-apps/tao#22

[lemarier]

Merged in tauri-apps/tao#28