_pyrepl: Fix raw buffer merge when coalescing pending input events #146589

Problem

In UnixConsole.getpending() (Lib/_pyrepl/unix_console.py), when draining the event queue and merging consecutive events into e, the code appends to e.raw with e.raw += e.raw instead of appending the second event's payload. That duplicates the first chunk instead of concatenating e2.raw.

Proposed fix

Use e.raw += e2.raw to match e.data += e2.data.

Linked PRs

• gh-146589: Fix raw buffer merge in UnixConsole.getpending() #146590