try auto rotate tick labels only when useful tdf#99883

By default we try to fit as many tick labels as possible on an axis.
One way is (auto) rotating the labels at 45 degrees.

But rotating only works for horizontal axes with horizontal text or
vertical axes with vertical text, else rotated tick labels need more space.

Join the check for this prerequisite with isAutoStaggeringOfLabelsAllowed.

while here make isAutoStaggeringOfLabelsAllowed local
and wrap stuff in anonymous namespaces

Change-Id: I5784d0e5aa42ff90927e19d0bd2c6fed488d39f4
Reviewed-on: https://gerrit.libreoffice.org/25792
Reviewed-by: Jochen Nitschke <j.nitschke+logerrit@ok.de>
Tested-by: Jochen Nitschke <j.nitschke+logerrit@ok.de>

0 files changed, 0 insertions, 0 deletions