https://bugs.documentfoundation.org/show_bug.cgi?id=132333

            Bug ID: 132333
           Summary: VIEWING Artifacts are shown at rendering with Skia
           Product: LibreOffice
           Version: 7.0.0.0.alpha0+ Master
          Hardware: x86-64 (AMD64)
                OS: Windows (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: [email protected]
          Reporter: [email protected]

Created attachment 159825
  --> https://bugs.documentfoundation.org/attachment.cgi?id=159825&action=edit
2 documents to show the problem and screenshots

When rendering with Skia is activated Writer in LO 7.0.0 builds from
/daily/master/Win-x86_64@tb77-TDF/2020-04-08_04.59.52/ and newer shows
artefacts in some situations when text parts are selected.
In the attached zip file there are some screenshots:
("Writer_selected_text_selected_scrolled_up_artefacts_+Options_view_Skia_is_activated.jpg"
+
"Writer_selected_text_selected_scrolled_up_artefacts_+About_(old)_Skia_is_activated.jpg").

The artefacts appear not always but on the way described below the behavior can
be forced:
- open "Test_artefacts.odt" from the zip attached file
- select text as shown in screenshot
"Writer_document_just_opened_text_selected_no_artefacts_+About_(new).jpg"
- scroll down the text
- --> in the moment the selected text starts rolling out of the window on the
upper edge the artefacts appear
- select other parts of the text --> artefacts appear too

The artefacts disappear completely or partially when selected text is rolled
out from the window first and then rolled in or completely when document is
newly painted e.g. by changing the zoom factor.

The problem exists in a similar form in Calc, see screenshot
"Calc_artefacts.jpg" in the zip file and document "Corona-Entwicklung_D.ods"
for demonstration.

In LO 7.0.0 builds from 2020-04-07 and older the problem doesn't exist.

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