Created attachment 153796 [details]
Example with dash line style on hairline
Open attached document. It contains a hairline (=line with width 0) with style "Line with Fine Dots". Save the file to docx and open this docx file. Notice, the line style is lost, and instead the default "solid" is used.
The error is, that in case of a hairline an empty custDash element is written instead of the needed dash stops.
I can confirm with Version: 184.108.40.206.alpha0+
Build ID: 2bed8af91fc2654b9ed2432f969d32d5741a529b
CPU threads: 4; OS: Linux 4.15; UI render: default; VCL: gtk3;
Fixed with commit https://cgit.freedesktop.org/libreoffice/core/commit/?id=57c9bdab377a00649299d1a4c9ed2f9e5e03b84e
Fix available in Version: 220.127.116.11.alpha0+ (x64)
Build ID: 61b757f31f25cda6d595f64226181c7a82ce8d7f
CPU threads: 8; OS: Windows 10.0; UI render: GL; VCL: win;
TinderBox: Win-x86_64@62-TDF, Branch:master, Time: 2019-09-07_17:48:35
Locale: en-US (en_US); UI-Language: en-US