Window not rendered after Hide()

[MonkAlex]

Use windows7

Create new project from Avalonia Application template
For MainWindow add:

        protected override void HandleWindowStateChanged(WindowState state)
        {
            if (state == WindowState.Minimized)
            {
                this.Hide();
                Task.Run(async () =>
                {
                    await Task.Delay(1000);
                    Dispatcher.UIThread.Post(() =>
                    {
                        var window = this;
                        window.Show();
                        window.Activate();
                        if (window.WindowState == WindowState.Minimized)
                            window.WindowState = WindowState.Normal;
                    });
                });
            }

            base.HandleWindowStateChanged(state);
        }

Run (netcore 2.1), minimize, wait
On minimize-show render broken and show black screen:

If i manual resize window after that - all rendered and work fine.
Keyboard events to change VM run render too.
Mouse events dont work.

UPD: also reproduce on second hide-show when run on windows10
not reproduced on macos

UPD2: linux mint 18 (in virtual box) showed bad, resize help too:

[MonkAlex]

On Windows7 help this simple code:

                        window.Show();
                        window.Width += 0.1;

Mint not tested.
Ugly, but work 😣

UPD: Width change raise InvalidateMeasure(); and its also help. Its correct solution for this problem?

[jmacato]

Confirmed bug on Cinnamon+Ubuntu 18.04.

[josegomez]

Can confirm this is still an issue on 0.9.9

Workarounds such as changing screen size, InvalidateMeasure() and InvalidateVisual() don't always work consistently.

[kekekeks]

Please, record the events sent to the window via xev -id <window id>. Window id can be obtained via xwininfo utility.

[alexhauser]

@kekekeks, here is a link to the recorded window events that you've requested:
https://pastebin.com/y4reQ70T

This is from the same app that @josegomez has posted screencasts of in the post above.
The last "minimize to tray" and then "restore" triggered the garbled display.

[kekekeks]

I don't see any Expose events being sent to the window (we are treating them in the same way as WM_PAINT). I guess we should handle VisibilityNotify in the same way and trigger an immediate repaint.