_pyrepl: Fix raw buffer merge when coalescing pending input events

[cuiweixie]

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

[cuiweixie]

PR: #146590

[picnixz]

This is a dupe of #145886. FTR, please don't use AI to find issues without checking them.