bug#36733: 27.0.50; Eshell taking long time to enter directory after TAB completion

[Ivan Kozlov]

I was probably wrong about the apparent total unsuitability of the markers.

I just realised the issue with argument deletion can be fixed trivially:

--- 
/gnu/store/1ffhlsa973ym7j2zsyrbm892jxcpzmqq-emacs-next-27.0.50-0.36abf68/share/emacs/27.0.50/lisp/minibuffer.el.gz
                                      
+++ #<buffer minibuffer.el.gz>                                                  
                                                                            
@@ -2132,6 +2132,7 @@                                                           
                                                                            
       (and completion-in-region--data                                          
                                                                            
            (and (eq (marker-buffer (nth 0 completion-in-region--data))         
                                                                            
                     (current-buffer))                                          
                                                                            
+               (< (nth 0 completion-in-region--data) (nth 1 
completion-in-region--data))                                                    
               
                 (>= (point) (nth 0 completion-in-region--data))                
                                                                            
                 (<= (point)                                                    
                                                                            
                     (save-excursion                                            
                                                                            

It works. I don’t know if it also breaks anything.

The problem with new line characters remains, but it really seems to be a 
different issue. In fact, can multi-line completion be useful in some cases? 
Maybe it is eshell that should tell the completion mode to stop when a command 
has been entered. I want to know how SPC works in the current scheme. RET 
should do the same in eshell.