Improved the bottom reaching detection.

[hitode909]

Sometime I can't swipe to next chapter on vertical content.
I found that top < this.container.scrollHeight is always true on that broken situation. For example, top is 2199.99 and this.container.scrollHeight is 2200.

epub.js/src/managers/default/index.js

Lines 496 to 501 in 3565e47

	let top = this.container.scrollTop + this.container.offsetHeight;
	if(top < this.container.scrollHeight) {
	this.scrollBy(0, this.layout.height, true);
	} else {
	next = this.views.last().section.next();

According to MDN, these numbers often have a floating decimal point.

Note: This property will round the value to an integer. If you need a fractional value, use Element.getBoundingClientRect()
Element.scrollHeight - Web APIs | MDN

In my smartphone(Pixel 6a), certainly screen width is 412.19px and screen height is 790.09px.

I changed the calculation formula introduced on MDN, it will correctly determine that you have reached the bottom of the container element.

• https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollHeight#determine_if_an_element_has_been_totally_scrolled

[svera]

This solves the problem with continuous mode and certain epub documents. Thank you @hitode909 !