[issue - dont merge] Button::is_pointer_button_down_on returns false

[usbalbin]

Describe the bug

Button::is_pointer_button_down_on() starts returning false after a while when still holding down the mouse button when the gui is refreshed(for example by the blinking cursor shown in the image)

To Reproduce
Steps to reproduce the behavior:

1. In the example modified in the PR
2. Click into the "Name" field so the cursor blinks
3. Hold down on the button, this now shows "Hello '{}', age {}"
4. Wait a second while keeping the button pressed
5. Boom - egui thinks the button is released while it is not

Expected behavior

I would have expected the button to not be released

Screenshots

The mouse is held over the button with the left mouse button kept down. I release the mouse which can be seen when the light border appears on the button

Desktop (please complete the following information):

• OS: 6.16.8-1-MANJARO with KDE X11

Additional context
Same thing on the clickable label works fine, no issue.

[github-actions]

Preview is being built...

Preview will be available at https://egui-pr-preview.github.io/pr/7727-show-issue

View snapshot changes at kitdiff

[usbalbin]

Same problem on Win11

[lucasmerlin]

The culprit is long press detection.

You can add Sense::click_or_drag to work around this:

            let response = ui.add(Button::new("Increment").sense(Sense::click_and_drag()));

            if response.is_pointer_button_down_on() {
                self.age += 1;
                ui.label(format!("Hello '{}', age {}", self.name, self.age));
            }