Bug#304091 I investigated the source code. jfbterm try to handle hardware status by esc_status_line() in vterm.c. It shrinks window size when hardware status line is used (by tsl,fsl capability) and enlarges window size when hardware status line is erased (by dsl capability). However, usual tty application assumes window size is fixed, so I suppose if hardware status line is used, the issues reporeted by this bug report would happen. As simple solutions, I delete capablities related with hardware status line from terminfo.jfbterm.

Bug#304020 I build with --enable-direct-color.