the patch needs to be udjusted: "${FILESDIR}"/${PN}-2.6.0-desktop.patch, otherwise copying the previous ebuild works.
*texstudio-2.8.2 (12 Aug 2014) 12 Aug 2014; Justin Lecher <jlec@gentoo.org> +texstudio-2.8.2.ebuild, +files/texstudio-2.8.2-desktop.patch: Version BUmp, #518430 *** This bug has been marked as a duplicate of bug 518430 ***