Lag when pasting from terminal since 0.37

[cotneit]

Platform: Windows 11
Terminal software: Windows Terminal, Wezterm

Since nushell 0.100.0 / reedline 0.37 there is noticeable lag when pasting is handled by terminal instead of nushell. PasteSystem from (system-clipboard feature) and PasteCutBufferBefore are not affected.

This is most noticeable when pasting URLs because paste happens in two stages, e.g. when pasting https://github.com/: first the part of URL till colon appears immediately (https:), delay, and then //github.com/ appears.

When colon is not involved, paste happens in a single stage, and lag seems to always happen when pasting more than 5 characters, pasting less than 5 characters always seems fine.

When colon is involved, lag happens when there are more than 5 characters on either side of the colon, and which side exceeds this limit affects when lag happens. When part before column exceeds it - lag happens immediately, when part after column exceeds it - paste happens in two stages (see URL example above), and lag happens after colon.

I narrowed this down to 9cb1128 (#846), before it the issue is not present.

Steps to reproduce

1. In nushell, paste https://github.com/ from system clipboard without using PasteSystem keybind / system-clipboard feature

Screenshots/Screencaptures

Recording doesn't always catch this, but it happens on every paste:

Screen.Recording.2025-04-30.181705.mp4