[fix] text nodes are not updated when repeated word is present

[suxin2017]

issuse 5931

export function set_data(text, data) {
	data = '' + data;
// In this case
// here. 
// WholeText is going to be equal to Hello World and the data is going to be the same
// what is wholeText ?
	if (text.wholeText !== data) text.data = data;
}

export function set_data_dev(text, data) {
	data = '' + data;
	if (text.textContent === '' && text.wholeText !== '') {
		if (text.wholeText === data) return;
	} else {
		if (text.textContent === data) return;
	}

	dispatch_dev('SvelteDOMSetData', { node: text, data });
	text.data = data;
}

Before submitting the PR, please make sure you do the following

• It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs
• This message body should clearly illustrate what problems it solves.
• Ideally, include a test that fails without this PR but passes with it.

Tests

• Run the tests with npm test and lint the project with npm run lint

[dummdidumm]

Could you add a test that fails without the fix?

[suxin2017]

您能否添加一个没有修复失败的测试？

here is online bug

I added a test case for testing

[Mlocik97]

I'm not sure if this fix will fix that bug, because well, you can have empty space at end or start of string that You interpolate. If it's adding just " " to NODE. But from code, I would said that's not exactly what You do.

So problem can be if Node contain for example:

"    text"

and you interpolate same string, after that string to NODE.
We propably need something to mark position where interpolated string in NODE start and where it end, or do some advanced comparision.

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