A secondary titlebar appears on Intellij 2018.2 with Material Theme installed.

The secondary titlebar shouldn't exist.
A secondary titlebar appears just under the real titlebar.
System
IntelliJ IDEA 2018.2 (Ultimate Edition)
Build #IU-182.3684.101, built on July 24, 2018
JRE: 1.8.0_152-release-1248-b8 amd64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
Windows 10 10.0.17134.191
Material Theme 2.7.0
material_custom_theme.xml
<application>
<component name="MaterialCustomThemeConfig">
<option name="treeSelectionColor" value="0a84ff" />
<option name="highlightColor" value="0a84ff" />
<option name="secondBorderColor" value="2a373e" />
<option name="tableSelectedColor" value="0a84ff" />
<option name="contrastColor" value="1e1e1e" />
<option name="disabledColor" value="4e4e4e" />
<option name="secondaryBackgroundColor" value="000000" />
<option name="buttonColor" value="2e3c43" />
<option name="selectionForegroundColor" value="ffffff" />
<option name="selectionBackgroundColor" value="0a84ff" />
<option name="textColor" value="dedede" />
<option name="foregroundColor" value="ffffff" />
<option name="backgroundColor" value="000000" />
</component>
</application>
material_theme.xml
<application>
<component name="MaterialThemeConfig">
<option name="version" value="2.7.0" />
<option name="selectedTheme" value="DARKER" />
<option name="highlightColor" value="80cbc4" />
<option name="isContrastMode" value="true" />
<option name="isMaterialDesign" value="false" />
<option name="isBoldTabs" value="true" />
<option name="isCustomTreeIndentEnabled" value="true" />
<option name="accentColor" value="0a84ff" />
<option name="useMaterialIcons" value="false" />
<option name="useProjectViewDecorators" value="false" />
<option name="statusBarTheme" value="false" />
<option name="tabsHeight" value="18" />
<option name="isCompactStatusBar" value="true" />
<option name="isCompactTables" value="true" />
<option name="accentScrollbars" value="false" />
<option name="useMaterialFont" value="false" />
<option name="compactDropdowns" value="true" />
<option name="upperCaseButtons" value="false" />
<option name="accentTitleBarColor" value="80cbc4" />
<option name="userId" value="3eb0de79:16407f022d0:-7fff" />
<option name="allowDataCollection" value="true" />
<option name="isHighContrast" value="true" />
</component>
</application>
Can you turn on "Material Components" (or change isMaterialDesign to true)?
Enabling Material Design Components does fix the issue. But I'm not a fan of MD in general. I installed the plugin just for the darker theme.
@mallowigi Turning on "Material Components" helped me. Thanks!
I'll try to fix this for the disabled components state
will be fixed in 2.7.2
Most helpful comment
Can you turn on "Material Components" (or change isMaterialDesign to true)?