Improved sliding window or improved sliding door and glazing bead supports applied thereby

A sliding window or sliding door with a leaf with a leaf frame that is composed of leaf profiles which each comprise two half-shells which are thermally connected to each other by an intermediate thermal insulator, whereby the leaf frame contains a rebate and one or more glazing bead supports and a panel supported by the one or more glazing bead supports in the rebate and whereby the leaf frame is supported by one or more roller cassettes with rollers, whereby the one or more glazing bead supports are separate from the roller cassettes, wherein at least one glazing bead support comprises a feed-through section for transmitting a weight of the panel or a part thereof to at least one concerned roller cassette and that the feed-through section extends through a bottom leaf profile of the leaf frame up to the one roller cassette.