(fix #2607): Fix router.back in abstract mode when 2 consecutive same routes appear in history stack #2771
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This PR provides a fix to the issue #2607.
Reproduction link
https://jsfiddle.net/Rocka/bhu5vkn8/3/
In abstract mode, if you try to navigate through your history with the same routes appearing consecutively in your stack history, the history index remains unchanged.
In History or Hash mode, this issue does not appear because history navigation is handled by the browser and not by vue-router. In all modes, we do not want to re-render a page if the current route and the next route are identical. However, in the case of abstract mode, we still need to update the history index whenever the current and next routes are the same since AbstractHistory handles its own history stack.