And what precisely happens, when I specify a track width for "all"
>    tracks?
>
>       * Is it understood as a default
>
>            - just for new tracks?
>
>            - for all tracks which don't explicitly specify otherwise?
>
>        * Or does it override older track specific specifications?
>
>

As the buttons are in the track details dialog the selection is for the
track only.

You can either choose:

* user defined limits or values for this track

* automatic limits for this track

* apply the globally stored limits to this track

If you select global limits you will see the current ones. And you can
change them. A change will affect every track where you chose to use
global limits. There is a small caveat: it will not update current
opened graphs. You have to reopen them. I haven't found a good solution
for this so far.

The initial idea behind the global limits was to colorize slopes with a
unified color pattern. And sometimes it might be useful if you want to
compare elevation profiles of several tracks. But I don't use that
feature very often. Usually I am satisfied with the automatic defaults.

As said, I do not consider these buttons as one of my best ideas, more
as a less worse bad idea. I hardly use that feature. If anyone has a
more inspiring vision on how to use that stuff and what it should be
able to do, she/he is welcome to improve it.

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