Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# LibreOffice Impress / Draw Application
+
+The core directory for the impress/draw applications.
+
+Think of impress as a hack on top of draw.
+
+`sd` module contains impress/draw specific code, non-shared UI and part
+of `ppt` and `pptx` filter, few other filters too.
+
+the slideshow UI lives here as well, the slideshow engine is in
+`slideshow` module though (including the 3D transitions engine
+`slideshow/source/engine/opengl`).
+
+the most used filters are ODF's `odp`, binary ppt and OOXML's
+`pptx`. their locations are listed below:
+
+ * `odp` import and export filters are in `xmloff` module (mostly `xmloff/source/draw`)
+
+ * `ppt` import is in `sd/source/filter/ppt` (big shared chunks are also in `svx`)
+ * `ppt` export is in `sd/source/filter/eppt` (big shared chunks are also in `svx`)
+
+ * `pptx` import is in `oox/source/ppt` (and uses a lot of
+   `oox/source/drawingml` and `oox/source/*`)
+ * `pptx` export is in `sd/source/filter/eppt` (mostly in `pptx-*` source
+   files) and shared part is in `oox/source/export`
+
+## PPTX Export / Import Filters
+
+PPTX export filter is split into 2 parts. Impress related part is in
+`sd/source/filter/eppt/pptx-*` and the other part is in
+`oox/source/export/` because it contains mostly code related to
+`DrawingML`, which is shared with writer and calc ooxml export.
+
+The export filter was written in 2009 IIRC and was not much extended
+feature-wise lately.
+
+## Future Works
+Add custom shapes export (see below). enhance text
+output, we don't write text style for indentation levels now, need to
+export `a:lvl1pPr`, `a:lvl2pPr`, ... elements.
+
+`PPTX` import was written by Sun/Oracle and then extended in LibreOffice
+a lot during bug fixing. It is located in `oox/source/ppt` and
+`oox/source/drawingml`. The areas with most bugs (at least until today)
+were shape placeholders and text style inheritance.