This is a combination of 7 commits.

This is the 1st commit:

oox smartart, picture strip: handle bitmap fill of pres nodes

There were two problems here:

1) We did not import bitmap fill from presentation nodes.

2) Presentation nodes contained properties with reference semantics, so
if you set a bitmap fill for a first and a second shape, then at the end
both shapes contained the second bitmap.

With this, both bitmaps are imported exactly once.

(cherry picked from commit 333e9ea1)

This is the commit #2:

oox smartart, picture strip: fetch # of children only once in snake algo

No functional changes intended.

(cherry picked from commit 90372d52)

This is the commit #3:

oox smartart, picture strip: expose aspect ratio of children for snake algo

The aspect ratio request of the Shape is not yet used in
AlgAtom::layoutShape(), though.

The heavy-lifting is needed, because the number of cols/rows in the
snake algorithm depends on the aspect ratio request from the child
algorithm, so need to transfer the aspect ratio from child algorithm ->
layout node -> shape -> parent algorithm.

Still no functional changes intended.

(cherry picked from commit a1e10b79)

This is the commit #4:

oox smartart, picture strip: fix too many columns with aspect ratio request

The bugdoc has 3 items in the picture strip and PowerPoint laid this out
as a single column with 3 rows (as a snake algorithm). We used to put
the first two items to the first row and the third item to the second
row.

Improve out layout by taking into account what aspect ratio the child
algorithms request: this way it's obvious that we should use a single
column in case we have a large enough aspect ratio and few enough items.

(PowerPoint also uses multiple columns without the aspect ratio
request.)

(cherry picked from commit 159e33ec)

This is the commit #5:

oox smartart, picture strip: fix lack of spacing around the picture list

The snake algorithm in PowerPoint seem to interpret spacing as follows:
if you have N elements, then there should be the requested amount of
spacing between the elements, and also double amount of spacing around
the actual list of elements.

With this, the SmartArt and the title shape in the bugdoc no longer
overlaps.

(cherry picked from commit 0a29c928)

This is the commit #6:

oox smartart, picture strip: fix lack of margin in text shapes

Shape text has two kind of spacing inside the shape's bounding box: the
shape-level margin and the paragraph-level one. Only the second was
handled in the tx algorithm so far, add support for the first.

The margins taken from constraints were way large by default: the only
explanation I found for that is that SmartArt layout sometimes
calculates in MMs, sometimes in Points, and the ratio between the two is
exactly the Impress / PowerPoint margin. So assume that indeed that unit
difference is the reason for the smaller in-PowerPoint margin values and
do the same on our side.

(cherry picked from commit 279c7f83)

This is the commit #7:

oox smartart, picture strip: fix too wide child shapes

Once the constraints determine the size, the aspect ratio may shrink one
dimension to achieve the requested ratio. Implement the case where a >1
ratio shrinks the width, so the container of the image-text shape pair
has correct aspect ratio.

(cherry picked from commit f4fbb127)

Change-Id: I7bac764c031e80bac532c4f97ebd5b5096401096
Reviewed-on: https://gerrit.libreoffice.org/68687
Tested-by: Jenkins
Reviewed-by: Andras Timar <andras.timar@collabora.com>