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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_UNCONFIRMED "
   title="UNCONFIRMED - Scrollers for long menus are not shown / black"
   href="https://bugs.documentfoundation.org/show_bug.cgi?id=132267">132267</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Scrollers for long menus are not shown / black
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>LibreOffice
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>6.3.0.4 release
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Windows (All)
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>UNCONFIRMED
          </td>
        </tr>

        <tr>
          <th>Keywords</th>
          <td>bibisected, bisected, regression
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>graphics stack
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>libreoffice-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>baron@caesar.elte.hu
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="http://bugs.documentfoundation.org/attachment.cgi?id=159746" name="attach_159746" title="Screenshot in 7.0 master build">attachment 159746</a> <a href="http://bugs.documentfoundation.org/attachment.cgi?id=159746&action=edit" title="Screenshot in 7.0 master build">[details]</a></span>
Screenshot in 7.0 master build

The following bug is Windows-specific.

When an opened menu is too long, and doesn't fit, scrollers appear on
top/bottom.
In the past this could be reproduced by making the window shorter, and moving
to the bottom of the screen, but recently LO's become smart, and moves the open
menu next to the item to fit, and no scrolling is needed. These days the bug
can be reproduced by switching to 150% scaling (on a "normal" sized screen with
full HD resolution or less).

Until 6.2.0.3 the scrollers appeared fine.
>From 6.3.0.4 the icons have disappeared.
Recently in 7.0.0.0.alpha0+ (bf536201ae83e7ca6a565eb8ff0dbc0e4e887d64),
possibly due to Skia, black rectangles are shown instead.

Bibisected the disappearing of the scrollers to the 6.2 backport of the
following commit using repo bibisect-win32-6.2. Adding CC: to Miklos Vajna.
<a href="https://cgit.freedesktop.org/libreoffice/core/commit/?id=c04169c586ef1d55b1d0ac469bb4fbd4f50bd08a">https://cgit.freedesktop.org/libreoffice/core/commit/?id=c04169c586ef1d55b1d0ac469bb4fbd4f50bd08a</a>
author          Miklos Vajna <<a href="mailto:vmiklos@collabora.com">vmiklos@collabora.com</a>>    2019-05-21 17:45:05
+0200
committer       Miklos Vajna <<a href="mailto:vmiklos@collabora.com">vmiklos@collabora.com</a>>    2019-05-21 23:59:28
+0200

"<a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - Flicker when hovering over submenus with default rendering"
   href="show_bug.cgi?id=125415">tdf#125415</a> vcl menu floating window: avoid flicker"

Not sure if knowing where the rectangles turned black is important, I'm
guessing fixing the original issue corrects that as well.</pre>
        </div>
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