Separator and 2 lines

[pjasiun]

When the second line of the menu appears it looks like there is missing some lines. The border effect which we had with a single line is broken:

It is not a problem when the separator does not touch top and bottom lines:

[oleq]

We decided to go with full-height separators because:

• they look great (especially when the UI is dark), setting boundaries to the dropdowns and grouping buttons,
• this kind of wrapping is not very common,
• if developers decide they want multi-line toolbars, they can easily customize the separator,
• most likely, at some stage we'll have to implement a dynamic grouping mechanism anyway, which is common in many apps if only to have more control over the UI on small (mobile) screens
  
  

[Reinmar]

I'd add one more point to @oleq's list – developers should not accept situations where wrapping appears. It's an issue itself and should be solved so there's no wrapping.

[oleq]

Since we ignore the case where the toolbar items wrap to the new line this issue is not valid. In the future, we may figure out some mechanism (my comment above) to handle such situations but there's no ETA for that.