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Using CTabFolder/CTabItem in RAP (2.3), the width of the items is always calculated using the default theming for CTabItem, and ignores any custom theming set using: myTabItem.setData(RWT.CUSTOM_VARIANT, "myVariant"); I use a smaller font for my theme compared to the default, so there is always a big (ugly) gap between the 'X' close image and the right side of the CTabItem.
By looking into the code I can confirm the issue.