The Roles panel renderer looped from the first row with a hard height cap and no scroll offset, so roles and model-keyed fallback chains past the visible height were never drawn and unreachable by keyboard, with no truncation indicator. Unlike the sibling provider list (model-browser windows via #windowStart/#ensureSelectedVisible), the Roles panel had no equivalent.
Window #renderRolesView around #roleIndex via #ensureRoleVisible, offset mouse hit-testing by the scroll start bounded to the visible count, and draw an up/down '+N more' hint when the list is clipped.
Fixes#8817
roboomp
aed63e7bd5