1. change system font size and/or resolution.
2. open new Calc spreadsheet
Look at the height of the row with the table names (just above the status bar). This height (and the font for the table names) do not adjust to the system font size and/or resolution
#36889 is essentially the same bug but very old. Nowadays we have bigger screens with larger resolutions, and then the tab bar, which is now independent from the scroll bar height, is very small if not adjusted to the system font.
commit https://gerrit.libreoffice.org/#/c/43328/ fixes translating from pt to pixel, so the tab bar height adjusts to the dpi resolution of the system font
(there once was an option in LibreOffice to set the dpi independently from the system settings, but that option was removed before LO 5.2)
commit https://gerrit.libreoffice.org/#/c/43605/ removes capping of the default font size, previously it was capped at (8*res_y/600+1.5) pt
attention: The cap removal affects all areas where the system font is used, not only the tab bar. This includes dialogs, widgets and row/col headings.
Bernhard Widl committed a patch related to this issue.
It has been pushed to "master":
tdf#113444 removed capping of default font size
It will be available in 6.0.0.
The patch should be included in the daily builds available at
http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
Affected users are encouraged to test the fix and report feedback.