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I want to create a base theme for my application and some themes that extend this base theme. The base theme will have some custom layouts. Some of the other themes may override this but most will use the same custom layouts. Can a theme inherit custom layouts, or do they have to be copied over to different themes/themename/layouts directories (and maintained separately) ?
Layout templates aren't inherited unfortunately. You could try using a StreamResource for those CustomLayouts which need a different layout depending on the theme. Use Application/Window.getTheme() to check what theme is in use, and load the corresponding file as a stream to the CustomLayout.