Scroll Event Modifiers Get Stuck

[MongooseStudios]

Describe the bug

When adding a modifier to a scroll event, Cogent does not see the control modifier until shift is pressed. At that point it will see the control modifier forever, until you click in the frame.

How to reproduce

Run example code Attempt to scroll in the middle Check terminal for stroll events - should be present Attempt to hold ctrl and scroll - should see unmodified scroll events still Tap shift, continue to hold ctrl - should now see control modifier AND shift modifier Release ctrl - only control modifier present on scroll Tap shift again - should now see shift modifier is "stuck" on scroll events Click, in the middle, and then scroll - should now see unmodified scroll events

Example code

package main

import (
	"cogentcore.org/core/core"
	"cogentcore.org/core/events"
	"cogentcore.org/core/styles"
	"cogentcore.org/core/styles/abilities"
	"cogentcore.org/core/styles/units"
	"fmt"
)

func main() {
	b := core.NewBody("modified-scroll-repro")

	scrollable := core.NewFrame(b)
	scrollable.Styler(func(s *styles.Style) {
		s.Grow.Set(1, 1)
		s.Border.Width.Set(units.Dp(4))
		s.SetAbilities(true, abilities.Scrollable)
	})

	scrollable.On(events.Scroll, func(e events.Event) {
		fmt.Println(e)
	})

	b.RunMainWindow()
}

Relevant output

Platform

Linux

[kkoreilly]

Thank you for reporting this. Interestingly, I cannot reproduce this at all on macOS, but it does reproduce fully on my Ubuntu VM, so it is some kind of platform-specific issue. We will work on fixing this when we have the time.