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I use a plugin_customization.ini file for preference customization in Eclipse rcp product. I added below preference in the file to set dark theme as default but it is not working. Can someone please help me ?

org.eclipse.e4.ui.css.swt.theme/themeid=org.eclipse.e4.ui.css.theme.e4_dark
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  • What sort of RCP? Is it a pure e4 rcp (application is org.eclipse.e4.ui.workbench.swt.E4Application) or a 3.x compatibilty rcp (using org.eclipse.ui.xxx plugins)? Commented May 23 at 9:28
  • I am having a pure e4 rcp application. I am using eclipse release 2022-06 as target platform Commented May 23 at 9:45
  • For e4 the CSS theme is normally set by cssTheme property of the product extension point Commented May 23 at 10:46
  • Thanks Greg. I tried it..This works when my system is in default theme settings and I set the cssTheme property to use dark mode. But when my system is in dark mode and I set the css theme to use e4_classic theme, the application still comes with the black theme. Can you help for this scenario? Commented May 26 at 16:23
  • The theme engine has fallback code that may choose dark mode. Debug what org.eclipse.e4.ui.css.swt.internal.theme.ThemeEngine is doing to to see why it is choosing that theme. Commented May 26 at 16:46
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