new feature title on collapse borderlayout region missing style in some themes

Steps to Reproduce

Run the following on ZK 8.5.2 FL with sapphire theme:

<zk>
	<borderlayout>
		<west title="West" size="25%" flex="true" maxsize="250" collapsible="true">
			west
		</west>
		<center border="none" flex="true">
			center
		</center>
	</borderlayout>
</zk>

Collapse the west border region.

Current Result

The title appear in the collapse region without styling.
Missing style include:

• Font
• Size
• Rotation (the text appear horizontal, but should appear vertical). Iceblue theme uses rotation 90deg in this case.

On new themes (iceblue, marigold, etc.) the title is rotated on collapsed panel, but it doesn't have any font styling, which makes the title look "unfinished".

Expected Result

All themes should include styling for this feature.

Debug Info

Happen on:
breeze
sapphire
silvertail
atlantic

Root Cause

Workaround