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Regina Henschel acfd9e9ca2 tdf#128345 PPTX: add transparence gradient for fill in chart

Export cases:
Add transparence gradient on solid color fill by treating the
color fill as gradient with identical start and end color.
Add solid transparence on color gradient, by treating transparence
as gradient.
Import: Add missing property PROP_FillTransparenceGradientName to
spnCommonPropIds so that it is available in spObjTypeFormatEntries.
Otherwise transparence gradients will be skipped on import.

Change-Id: I56218ec1afcc5bd1ce0324ca50c03e0b44f76c58
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/99464
Tested-by: Jenkins
Reviewed-by: Regina Henschel <rb.henschel@t-online.de>

2020-08-09 12:15:54 +02:00