Just downloaded LO 22.214.171.124 specifically because of the higher order polynomial trendline function in Calc. That works very well (this was the one thing Excel still had over Calc). However, in formatting the chart area to put a neat line around the chart: Calc completely ignores Format Chart Area → Borders → Line properties → Style: Continuous → Color: Black → Width: 0.02 or whatever → Transparency: 0%. No border line appears. Is this a bug or did I make some error? Thanks!
You found a bug and there is workaround.
When you in editing mode of chart (gray border with small black squares) and you do "Format Chart Area → Borders → Line properties → Style: Continuous → Color: Black → Width: 0.02 or whatever " you will not get a border. I tested it on LibO 126.96.36.199 on XP.
Please report this as a bug at; https://www.libreoffice.org/get-help/bug/
and thereafter add the bug number here so others can add comments.
Leave the editing mode of the chart and click it only once (green squares around)
Right click on the chart > Line > select anything but not “none” and you have a border.
The bug already seems to be reported here: fdo#75380
Bug 75380 - FORMATTING: Can’t Create a Border Around a Chart
Status: RESOLVED FIXED (LibreOffice 4.2.7 / 4.3.1)