Bind Shift+Space to Space by default

[gpanders]

Fish version: 3.4.1
OS: macOS 12.3
Terminal: iTerm2

When using a terminal that supports the CSI u modifiers, Shift+Space is sent as \x1b[32;2u. This is the case for e.g. iTerm2. Unfortunately, Shift+Space is an extremely easy combination to mistype when one simply meant to insert a space. Consider the case when you're setting an environment variable:

set -U SOME_VAR foo

After typing Shift+r to enter R if I press Space while my finger is still holding shift, the sequence \x1b[32;2u is sent instead of a space. This happens quite often (for me, at least).

It is possible to tell fish to simply insert a space when this sequence is received:

bind \e\[32\;2u 'commandline -i " "'

I propose making the above binding a default as a convenience. I don't have any data for this assertion, but I would hazard a guess that most people would want Shift+Space to simply insert a space. Those who want to use that extra combination for something else can always map it themselves, though I'd bet that is a minority use case.

[krobelus]

I don't have any data for this assertion, but I would hazard a guess that most people would want Shift+Space to simply insert a space.

I agree, because this makes it easier to type all caps.

So I think we definitely want that binding (I assume it doesn't collide with anything else).

What key sequence does Shift+Backspace send for you? This might have the same problem.

---

A related problem is that I get \e\[27\;5\;13~ when I press Control+Return in the foot terminal.
I often trigger this accidentally after a Control+F that accepts an autosuggestion.
Should probably map that too by default, to match the behavior of traditional terminals.

[gpanders]

What key sequence does Shift+Backspace send for you?

\e[127;2u