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Linux Mint 20, Emacs 27.2

I want to find text "end" in the org files AND java files in my folder (recursively). So I use rgrep

M-x rgrep 

Step1 enter image description here

Step2 enter image description here

But when I try to input *.org SPC *.java, I can't type SPC. I get message "No match"

I know that I can use C-q SPC but I want type SPC only by type SPC

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C-hkSPC tells us:

SPC runs the command minibuffer-complete-word (found in
minibuffer-local-completion-map), which is an interactive compiled
Lisp function in ‘minibuffer.el’.

Complete the minibuffer contents at most a single word.
After one word is completed as much as possible, a space or hyphen
is added, provided that matches some possible completion.
Return nil if there is no valid completion, else t.

Which firmly suggests that changing this particular binding is going to affect more than just rgrep prompts. Still, you can do this as follows if you wish to:

(define-key minibuffer-local-completion-map (kbd "SPC") nil)

You've already mentioned one workaround with C-qSPC but there's another one which is almost as easy to type as SPC itself:

M-SPC runs cycle-spacing which, in the absence of any space at point, inserts a single space. YMMV, but this binding is sufficiently convenient for me to not care when SPC has a non-space binding.

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