Created attachment 118176 [details]
1) Open http://cgit.freedesktop.org/libreoffice/core/plain/chart2/qa/extras/data/pptx/stacked-bar-chart-hidden-series.pptx
2) Close it and tell it not to save changes
Not sure if this should be considered a regression as it was fine in 4.4 or an enhancement because the start center color was changed in 5.0.
With the change at 5.0 in the Thumbnail view default grayscale pallet to Gray7/Gray2, I have no issue with the transparent 128px icons showing on the Gray7 background for non-thumbnailed preview items. LO Base database items as another example.
I don't think adding a white (or other color) background is necessary. And acutally would look garish. Perhaps we could lose the Gray2/Gray7 outline (changes on mouse over). But otherwise leave it be.
Created attachment 118229 [details]
OSX LO 5.1 looks good to me
Agree with VSF. Looking good to my eyes. I think I'd even prefer the current solution above having something white behind that icon.
Jay, if you disagree or want further UX advise, please re-open and set keyword accordingly.
looking good to me too. I don't want to make an white background.
Not sure what would be the benefit of hardcoding a white background there. Your bugs state the word "should" but no rationale backs that. And I do not see the point here.
And... please do not leave resolved bugs with UX-Advise CCed; it's meant to be temporary.