Lets say there's 3 cells - 1, 2, 3. Cell 1 has left border applied, cell 3 has right border applied. When merging these cells, cell 1 retains it's border, while cell 3 has it's border reset.
Steps to Reproduce:
1. apply left border to cell B1, right border to cell D1.
2. merge these cell.
cell B1 retains left border, cell D1 doesn't retain right border.
Both borders are retained, as they're not in conflict with the merge.
User Profile Reset: No
Build ID: 188.8.131.52-5.fc31
CPU threads: 16; OS: Linux 5.5; UI render: default; VCL: gtk3;
Locale: en-IE (en_IE.UTF-8); UI-Language: en-US
Confirmed for version 184.108.40.206
I think it's because merged cell has the format from first up-left cell from selected range for merge.
Mike, what's your opinion here?
Yes, only in simplest cases there are cell borders that alone fully define some resulting border. Normally, each border of merged cell is originally represented by borders of several cells; e.g. 2x2. Each such cell may have own border ... so either we create complex rules that would definitely result in surprises for many, and anyway will cause reports because of "wrong" behaviour, or we keep it simple: just use the formatting of the first cell.
IMO - WONTFIX. Just because any strategy here is no better, but this one has advantage of being simple, both in implementation, and in understanding.
Thanks, Mike. Let's close it as WONTFIX