resizing moves window

Affected version

master, Wayland

Bug summary

Resizing weston-terminal, and potentially other clients that resize in discrete steps, results in moving the window outside of the screen and the warning No rect to clip to found! to appear.

The same issue, although not to the extent where the window moves outside of the screen, happens with clients such as weston-clickdot or kodi (in floating mode), where a window would move when resized to a smaller size by a drag&drop from the top/left.

This is a follow-up issue for #1447 (closed).

Steps to reproduce

1. launch weston-terminal
2. resize (decrease size) via drag&drop from the top/left side

What happened

The entire window moves and may move outside of the screen.

What did you expect to happen

The bottom-right edge of the window should keep a constant position. The window should not move.

Relevant logs, screenshots, screencasts etc.

mutter_weston_terminal_bug