https://bugs.documentfoundation.org/show_bug.cgi?id=150145

            Bug ID: 150145
           Summary: Missing row of pixels in tiled rendered text after
                    pressing Enter in document
           Product: LibreOffice
           Version: 7.4.0.0 alpha0+
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Keywords: bibisected, bisected, regression
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected]

Created attachment 181411
  --> https://bugs.documentfoundation.org/attachment.cgi?id=181411&action=edit
Sample ODT

Open the attached document in gtktiledviewer in a local build, eg. using the
following command:
bin/run gtktiledviewer $PWD/instdir/program <file name with location>

Find the → near the end of the document, and press Enter after it.

=> Note how the top row of pixels in the line "123456789" disappears (visible
in digits 1 and 4).

This started happening after the following commit in 7.4:
https://cgit.freedesktop.org/libreoffice/core/commit/?id=bb495c6a2f00346698a041bce69a5a97effc79d7
author          Caolán McNamara <[email protected]>    2022-01-17 12:48:43
+0000
committer       Caolán McNamara <[email protected]>    2022-01-17 17:23:18
+0100

"tdf#144862 set default render mode to LayoutAndMatchRender"

Since this commit only sets the new glyph positioning mode as default, the bug
can be checked in older builds by setting the config item
'GlyphPositioningMode' to 2 manually. This config was introduced by the first
commit in this series, and has been removed since:
https://cgit.freedesktop.org/libreoffice/core/commit/?id=39a57fa8c047227060915534e64c4e90affa4b1a

Since the characters are shown correctly in the above "earliest" commit, the
bug could be bibisected further, which pointed to the following commit:
https://cgit.freedesktop.org/libreoffice/core/commit/?id=935761709fb7629c8d23aa5dc8bfcbd2988f5bbf
author          Caolán McNamara <[email protected]>    2022-01-12 20:44:37
+0000
committer       Caolán McNamara <[email protected]>    2022-01-13 20:26:25
+0100

"tdf#144862 adjust positioning experimental options"

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