Make some modifications to the notebook tabs so they do not expand

when the spinner is shown.  Doing this in a way so that the text
doesn't bounce around when the spinner is shown and hidden requires a
ugly ugly hack of giving the label a fixed size instead of letting the
GtkBox give it an appropiate width, but afaik this isnecessary (and
the old gtk2 code was using the same hack).

While in here, give the Arrow name to the arrow button itself and not
the GtkArrow it holds, and remove the .button#Arrow CSS as we don't
want to remove the border from this button, only the tab close and
fancy_bar buttons.

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