related tdf#158031 editeng: GetFieldAtSel...(+look before cursor)

Nearly a No-Functional-Change, but not quite.
For practical and intentional purposes, it can be considered NFC.

Although I didn't find an actual case where it happened,
a code read says SelectFieldAtCursor COULD select a non-field.
It assumed that previous code had already identified that there
must be a field here.

Well, I want to extend GetFieldAtSelection to check backwards
to solve bug 158031 anyway, so I might as well "fix"
this assumption to only select a valid field.

This function REALLY depends on
GetFieldAtSelection working properly.
So, I put some asserts in to ensure that stays true.

Change-Id: Ie22945a418497511501b04df5e17071d977cbd5b
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/158855
Tested-by: Jenkins
Reviewed-by: Justin Luth <jluth@mail.com>

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