combobox doesn't render on windows?

[markgician]

Is it a known issue that combobox only render itself after mouse hoover over? This only happens in windows build, is there way to force to redraw the UI? Thanks!

[andlabs]

It is a known issue but I can't figure out on what configurations it happens... keep this open until further notice.

[kfsone]

This reproduces consistently for me: Go 1.16, Windows 10 x64:

https://gist.github.com/fbd4d52084621c49b5bf0b569b9195b4

	package main

	import (
		"fmt"
		"github.com/andlabs/ui"
		_ "github.com/andlabs/ui/winmanifest"
	)

	func makePage1() ui.Control {
		return ui.NewLabel("Page 1")
	}

	func makePage2() ui.Control {
		vb := ui.NewVerticalBox()
		vb.SetPadded(true)

		vb.Append(ui.NewLabel("Choose"), false)

		strings := make([]string, 300)
		for i := 0; i < len(strings); i++ {
			strings[i] = fmt.Sprintf("This is a string to choose %d", i)
		}
		cbox := ui.NewCombobox()
		for _, entry := range strings {
			cbox.Append(entry)
		}
		vb.Append(cbox, false)

		return vb
	}

	func setupUI() {
		win := ui.NewWindow("Test", 800, 600, true)
		win.OnClosing(func(*ui.Window) bool {
			ui.Quit()
			return true
		})
		ui.OnShouldQuit(func() bool {
			win.Destroy()
			return true
		})

		tabCtrl := ui.NewTab()
		win.SetChild(tabCtrl)
		win.SetMargined(true)

		tabCtrl.Append("Tab 1", makePage1())
		tabCtrl.SetMargined(0, true)

		tabCtrl.Append("Tab 2", makePage2())
		tabCtrl.SetMargined(1, true)

		win.Show()
	}

	func main() {
		ui.Main(setupUI)
	}

When you switch to Page 2, the combobox appears invisible until you mouse over it.

[kfsone]

After switching & mousing over, it remains rendered if you switch away & back or to a 3rd tab.

[kfsone]

Thinking it might be related, but there doesn't appear to be a way to prime a ComboBox with a selection:

  cbox := ui.NewComboBox()
  addEntries(cbox)
  cbox.OnSelected(func(_ *ui.Combobox) { panic("on selected") })
  parent.Append(cbox, false)
  cbox.SetSelected(0)
  win.Show()

edit: my bad, cbox.SetSelected never calls OnSelected.