tdf#121300 sw: consistent fly at-pargraph selection

As a follow-up to commit 28b77c89dfcafae82cf2a6d85731b643ff9290e5, add
IsSelectFrameAnchoredAtPara() function and use it to harmonize at-para
fly selection across all relevant operations:

* CopyImpl:
- it had a pre-existing bugs that would lose a fly anchored to the
2nd (1st fully selected) node of a redline
- remove a bunch of code for finding the last node of the body content,
which doesn't matter for the remaining at-fly checks
- flys that already existed at the insert position need to have their
anchors corrected

* DeleteRange:
- get rid of the bDelFwrd checks

* MoveRange:
- the ALLFLYS flag would be obsoleted by the new selection, were it
not for the writerfiler "special hack", see below

* also adapt A11y and UI selection, SwRootFrame::CalcFrameRects()

The selection behavior is changed:

* the bDelFwrd case is quite odd, some code was checking whether a
deletion was "forward" or "backward" and removing only the flys at the
point node while retaining the flys at the mark node; this worked in a
very non-obvious way relying on sw_GetJoinFlags actually calling
Exchange() on the cursor, and then SwUndoDelete stored it in
m_bJoinNext, but it turns out that only SwUndoMove also has a
m_bJoinNext and it's dead, and no other Undo has such a flag, so this
only worked for "delete". It's not obvious what the value of this is,
let's just ignore the "direction".

* Selections exclude the start and end position except if it's a fully
selected node or at the start or end of a section (i.e. Ctrl+A should
also select every at-para fly).

* An exception is made in case the selection looks like it's a
backspace/delete joining 2 paragraphs; flys are not deleted in that
case because it seemed annoying (and as it happens, Word does not
appear to delete flys in that case), particularly if both of the nodes
are already empty. This is done with a heuristic, it's conceivable to
pass down some flag from DelLeft()/DelRight() but probably this is
good enough.

A special hack is needed to keep writerfilter happy for now; it likes to
anchor flys at nodes which it then deletes in RemoveLastParagraph(),
which likely could be improved there.  The ALLFLYS usage in
SwRangeRedline::MoveFromSection() could be removed (because the
end-of-section check already handles the case) except for this, because
it turns out that the ODF import runs SetRedlineFlags with a temporarily
reset IsInXMLImport() flag because of its effect in thints.cxx, so
during the move IsSelectFrameAnchoredAtPara() can't check it.

tdf#108124 scenario works better, now everything that's selected is both
copied and deleted.

Fixes the problem where an at-para fly at the 2nd node of a redline
where the 1st node is partially deleted was lost on ODF export.

Change-Id: I168013665e70ff0a5f198e09f3fa3afc06ba0449
Reviewed-on: https://gerrit.libreoffice.org/84576
Tested-by: Jenkins
Reviewed-by: Michael Stahl <michael.stahl@cib.de>

2 files changed, 222 insertions, 0 deletions

diff --git a/sw/qa/extras/uiwriter/data/redline_fly_at_para_one_paragraph.odt b/sw/qa/extras/uiwriter/data/redline_fly_at_para_one_paragraph.odt
new file mode 100644
index 000000000000..a4b41e4ec25d
--- /dev/null
+++ b/sw/qa/extras/uiwriter/data/redline_fly_at_para_one_paragraph.odt
diff --git a/sw/qa/extras/uiwriter/data/redline_fly_duplication_at_para_2nd_paragraph.fodt b/sw/qa/extras/uiwriter/data/redline_fly_duplication_at_para_2nd_paragraph.fodt
new file mode 100644
index 000000000000..230159513ba0
--- /dev/null
+++ b/sw/qa/extras/uiwriter/data/redline_fly_duplication_at_para_2nd_paragraph.fodt
@@ -0,0 +1,222 @@
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