Zsh 5.1 and bracketed paste

TL;DR. Jump to code.

In short, Zsh 5.1 introduced bracketed paste mode¹ and turned it on by default (as it seems to me²). It is nice in certain ways — I appreciate the change, yet I was bitten nevertheless. In at least two ways:

1. Most annoyingly, url-quote-magic doesn't work anymore when pasting URLs, so for example if I paste

   https://www.google.com/search?q=zsh

   without typing in a single or double quote first, the ? and = won't be backslash-quoted by default, which causes an error when passed unnoticed (out of habit).

2. The Emacs shell³ is littered with ^[[?2004h and ^[[?2004l around every prompt.

The solution? Zsh now also ships with bracketed-paste-magic that resolves exactly breakage #1 (and a bit more); to quote comments from the linked source file:

Starting with zsh-5.1, ZLE began to recognize the "bracketed paste" capability of terminal emulators, that is, the sequences $'\e[200~' to start a paste and $'\e[201~' to indicate the end of the pasted text. Pastes are handled by the bracketed-paste widget and insert literally into the editor buffer rather than being interpreted as keystrokes.

This disables some common usages where the self-insert widget has been replaced in order to accomplish some extra processing. An example is the contributed url-quote-magic widget. The bracketed-paste-magic widget replaces bracketed-paste with a wrapper that re-enables these self-insert actions, and other actions as selected by the zstyles described below.

And to resolve breakage #2, just disable bracketed paste altogether for dumb terms.

Putting it together:

# turn off ZLE bracketed paste in dumb term
# otherwise turn on ZLE bracketed-paste-magic
if [[ $TERM == dumb ]]; then
    unset zle_bracketed_paste
else
    autoload -Uz bracketed-paste-magic
    zle -N bracketed-paste bracketed-paste-magic
fi

09/22/2015 update. I only read NEWS and not README, so I missed out on a very clear announcement of the bracketed paste incompatibitilies (between 5.0.8 and 5.1):

The default behaviour when text is pasted into an X Windows terminal has changed significantly (unless you are using a very old terminal emulator that doesn't support this mode). Now, the new "bracketed paste mode" treats all the pasted text as literal characters. This means, in particular, that a newline is simply inserted as a visible newline; you need to hit Return on the keyboard to execute the pasted text in one go. See the description of zle_bracketed_paste in the zshparams manual for more. "unset zle_bracketed_paste" restores the previous behaviour.