Random behavior of input box selection

In the 5.8.0-RC1, in most of input boxes the whole text is highlighted/selected at first mouse click.

I was then wondering if this is intended to happen in this release as previous releases do not behave the same way.

Also, there are boxes here and there where this does not happen, so it's pretty annoying as once the user gets used to it (for example one has now to remember to click twice if he doesn't want to modify the whole text but part of it) there are then places where this behavior switches back to old style.