[Bug]: Island side toolbars have solid background and are not rounded

[fteotini]

Describe the bug

Hi, thanks for the awesome plugin.

As per title, it seems that side toolbars get wrongly rendered when in island layout: no gradient, no rounded borders.
What's strange is that on the "What's New" page, the provided screenshots show the correct behavior

To Reproduce

1. Enable Island for custom themes under Advanced Settings > Appearance
2. Enable Island layout in Material Theme UI settings
3. Choose Material Oceanic theme

Expected behavior

Both sidebars should have a gradient background as the top mainbar

Material Theme Version

v10.6.0 Free

IDE

Rider

System Info

JetBrains Rider 2025.3.0.4
Build #RD-253.28294.356, built on December 10, 2025
Source revision: 4653307066246

Runtime version: 21.0.8+9-b1163.69 aarch64 (JCEF 137.0.17)
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
Toolkit: sun.lwawt.macosx.LWCToolkit
macOS 26.1
.NET Core v9.0.10 ARM64 (Server GC)
GC: G1 Young Generation, G1 Concurrent GC, G1 Old Generation
Memory: 2048M
Cores: 14
Metal Rendering is ON
Registry:
  ide.balloon.shadow.size=0
  vcs.log.index.enable=true
  ide.intellij.laf.enable.animation=true
  ide.new.editor.tabs.vertical.borders=true
  ide.animate.toolwindows=true
  ide.lookup.shrink=true
  ide.experimental.ui=true
  ide.mac.bigsur.window.with.tabs.enabled=false
  ide.editor.tab.selection.animation=true
  ide.colorful.toolbar.gradient.radius=2000
  terminal.new.ui.reworked=true
  find.in.files.split=false
  rider.codeVision.fitToContent.enabled=true
  llm.show.ai.promotion.window.on.start=false
  rider.codeVision.zeroWidth.preload.enabled=true
  find.in.files.split.actions=false

[mallowigi]

The new version is not approved by JetBrains yet

[RSickenberg]

This. @mallowigi what version do you talk? 10.7.0 ?

[mallowigi]

Yes

[RSickenberg]

Apparently not working :(

[mallowigi]

What is not working?

[RSickenberg]

What is not working?

Like the original report, the left bar is not rounded (here on my screenshot, top left) but still having latest plugin version

[mallowigi]

The left bar shouldnt be rounded, instead it should blend with the background.

[mallowigi]

Reopening because there is still a border happening sometimes.