Description:
(Working with table without cell or table borders) When I add a row or column using toolbar button, I can see all borders appeared (figure 1), then in few milliseconds, some borders are unset so there are only table borders (figure 2). When table is created or row is added using Tab key, all borders in table are visible (figure 1).

It really changes border style -- borders are also saved in a file (*.odt).

Figure 1:
┌──┬──┐
├──┼──┤
└──┴──┘
Figure 2:
┌─────┐
│     │
└─────┘

Steps to Reproduce:
1. Run LibreOffice
2. Create an empty Writer Document
3. In menubar: Table->Insert Table...
4. Uncheck Border
5. Press Return (Enter)
--> Result 1
6. Select all table cells
7. In menubar: Table->Properties...
8. Go to Borders tab
9. Click "Set No Borders" preset
10. Click OK
11. Deselect table
12. Go to right column, bottom row
13. Press Tab
--> Result 2
14. Select all table cells
15. In menubar: Table->Properties...
16. Go to Borders tab
17. Click "Set No Borders" preset
18. Click OK
19. Deselect table
20. Go to right column, bottom row
21. In menubar: Table->Insert->Columns Right
--> Result 3

Actual Results:  
Result 1: Table has borders
Result 2: Table has borders
Result 3: Table has border around it

Expected Results:
Result 1: "Borders" option is not checked -- it created borderless table in older versions
Result 2: It only added row -- table must keep border settings
Result 3: It only added column -- table must keep border settings


Reproducible: Always


User Profile Reset: No



Additional Info:
[Information automatically included from LibreOffice]
Locale: cs
Module: TextDocument

=== SW ===
OS: Windows 10
OS is 64bit: yes

There are 3 result states, 2 of them are during Reproduction. (After 5th, 13th and 21st step)

Referenced "figures" are on the end of Description.

=== About LibreOffice ===
Version: 6.0.0.3 (x64)
Build ID: 64a0f66915f38c6217de274f0aa8e15618924765
CPU threads: 4; OS: Windows 10.0; UI render: default; 
Locale: cs-CZ (cs_CZ); Calc: group


User-Agent: Mozilla/5.0 (Windows NT 6.3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36