The editor's text cursor is no longer black in dark themes. It never named a colour, so the framework default applied: a black caret on a near-black page, in both Markleaf green and Material You. It now takes the theme's accent colour, the one the search field already used - light green in dark Markleaf green, your wallpaper's tone under Material You. Light themes keep a dark caret, and nothing else about the editor changed.