[Libreoffice-bugs] [Bug 141063] New: White lines during scrolling across bitmap images

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=141063

            Bug ID: 141063
           Summary: White lines during scrolling across bitmap images
           Product: LibreOffice
           Version: 7.2.0.0.alpha0+ Master
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: UI
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: thorsten.wagner.4 at gmail.com

Description:
Using LO 7.1.1 there were issues with alpha blending (see screenshot 1).
Something has changed and this issue disappeared with LO 7.1.2 (see screenshot
2). Furthermode bitmap images were rendered blurry with LO 7.1.1 (see
screenshot 3). With LO 7.1.2 these images are sharp again (see screenshot 4),
but there is a new issue: When scrolling over window borders white lines remain
within the images (see screenshot 5).

Steps to Reproduce:
1. Open attached file "Example.odt" with Writer
2. Scroll up and down in a way that the images crosses the upper or lower
window border

Actual Results:
White lines remain after scrolling (see screenshot 5)

Expected Results:
Image is displayed without white lines (as in screenshot 4 prior to scrolling)


Reproducible: Always


User Profile Reset: No



Additional Info:
Issue existis with all LO applications (tested with Writer and Impress).
Changes between LO 7.1.1 and LO 7.1.2 concern not only macOS (which has been
used for the screenshots). Change between LO 7.1.1 and 7.1.2 is visible e.g.
using GTK too.

Issue existis on master as well as on LO 7.1.2 branch.

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