Description:
Some dialogs with only three tabs show inconsistent rounded edge behaviour.

The first tab (left hand side - LHS) only has rounded right hand side (RHS) corners/edges when unselected. When it is selected after switching from another tab, the round edges appear on the LHS of the tab.

The middle tab has straight edges/corners whether selected or unselected.

The third tab (RHS) has rounded corners on the RHS when selected but square edge corners when unselected.

Steps to Reproduce:
1. Open a new Writer document
2. Tools > Macros > Organize Macros > LibreOffice Basic
3. Click on the Organize button
4. A 3-tab dialog window is displayed. By default, the first tab is selected, and the corners on the LHS of that tab are rounded, whereas the RHS corners are square. The other two tabs have square corners.
5. Click on the middle tab - the edges remain square, however, the 1st tab now has rounded RHS corners.
6. Click on the 3rd tab - the RHS corners are now rounded, whereas the LHS corners are square

Actual Results:  
The tabs display inconsistent rounding behaviour leading to an unfinished UI experience

Expected Results:
The corners should either be all rounded, or all square, to be consistent


Reproducible: Always

User Profile Reset: No

Additional Info:


User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:50.0) Gecko/20100101 Firefox/50.0