New: Added themable attribute for divider thickness in table header view

[mrcarlberg]

No description provided.

[cappbot]

Milestone: Someday. Label: #new. What's next? A reviewer should examine this issue.

[ahankinson]

-#new
+feature
+AppKit
+#needs-improvement

[ahankinson]

I think "@divider-thickness" needs to be pre-defined in the theme file. Travis seems to be unhappy about the theme setting:

CPViewTest..
addError test=[CPViewTest testCanFlushPendingLayoutWork]: CPTableHeaderView does not contain theme attribute 'divider-thickness'
Trace not implemented
....
CPSplitViewTest...
addError test=[CPSplitViewTest testAutosave]: CPTableHeaderView does not contain theme attribute 'divider-thickness'
Trace not implemented

[cappbot]

Milestone: Someday. Labels: #needs-improvement, AppKit, feature. What's next? The code for this issue has problems with formatting or fails a capp_lint check, has bugs, or has non-optimal logic or algorithms. It should be improved upon.

[primalmotion]

Merged, Thanks!

+#fixed

[cappbot]

Milestone: Someday. Labels: #fixed, AppKit, feature. What's next? This issue is considered successfully resolved.