I use dotted borders frequently in my spreadsheets, but the 6.x releases aren't rendering them correctly on my screen; previous versions (e.g: LO 5.4.x) rendered them fine, and other border types appear to render more or less* correctly.
This seems to be a screen rendering bug only; cell borders render correctly when (e.g.) exported to PDF (but I have no need of that, so...) .
Steps to Reproduce:
Format any range of cells with the dotted border style.
Dotted cell borders (and vertical i.e. left/right borders in particular) appear to alternate with a cycle of about 2/3 solid 1/3 dotted (the exact pattern seen may vary with zoom level).
Dotted borders should render consistently for the given zoom level -- e.g. 100% zoom should render cleanly alternating pixels for that border.
User Profile Reset: No
I said "more or less" because the border preview (Format > Cells... > Border) also rendered several more border types incorrectly -- but on the actual screen (at 100% zoom) only dotted borders appear affected.
This seems to occur regardless of whether hardware acceleration and/or openGL were enabled in the config.
Created attachment 148461 [details]
Sample file with assorted border types
1 - Check how cell borders render at various zoom levels (especially 100%).
2 - Check how cell borders render in Format > Cells... > Border .
Created attachment 148464 [details]
Screenshot of sample file
Screenshot taken from 100% zoom level, as it displays on my screen.
Build ID: 6740443311268b7d918bf4f43134d64fb78a0109
CPU threads: 4; OS: Windows 6.3; UI render: default; VCL: win;
TinderBox: Win-x86@42, Branch:master, Time: 2019-01-15_23:37:04
Locale: nl-NL (nl_NL); UI-Language: en-US
Dotted borders lines look like "dashes" or partial solid lines depending on zoom level
Build ID: f3153a8b245191196a4b6b9abd1d0da16eead600
Bibisected with Linux 6.0 repo to https://git.libreoffice.org/core/+/f65cbae8947c0462b35c8d3c3d5124e431b100b6^!/
borderline: correct problems with border display
Adding Cc: to Armin Le Grand