Pressing copy button twice does not reset to correct text

[rowanc1]

When clicking the copy button twice, it reverts to "Copied!".

This is due to using the last data-tooltip in oldText rather than the localized string.

sphinx-copybutton/sphinx_copybutton/_static/copybutton.js_t

Lines 57 to 61 in 1cd8420

	const temporarilyChangeTooltip = (el, newText) => {
	const oldText = el.getAttribute('data-tooltip')
	el.setAttribute('data-tooltip', newText)
	setTimeout(() => el.setAttribute('data-tooltip', oldText), 2000)
	}

Example:

• First time, just click once
• Second time, click twice within 2seconds-- any time after that the hover is "Copied!"

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