Lumo theme is applied on top of a Material theme

[mvysny]

I am using a Material theme in my app. When I add this addon to my app, suddenly it looks like as if Lumo theme as included as well: the buttons and the textfields change their appearance:

Material theme before adding the addon dependency:

After adding the addon dependency:

Easy to reproduce:

1. git clone the Vaadin skeleton starter and checkout the v23 branch, to bring in Vaadin 23.3.12.
2. Add @Theme(themeClass = Material.class) to the Application class.
3. Add this addon as a dependency to pom.xml:

        <dependency>
            <groupId>org.vaadin.addons.componentfactory</groupId>
            <artifactId>vcf-pdf-viewer</artifactId>
            <version>2.7.2</version>
        </dependency>

4. Run the app.

• Vaadin version: 23.3.12
• Addon version: 2.7.2
• Java 11
• Browser: Firefox 112.0.2