Fix apparently wrong delete and delq value discards (bug#61730)

* lisp/startup.el (normal-top-level):
Update process-environment in case the DISPLAY variable comes first.
Also stop iterating over initial-environment once the first DISPLAY
is found.
* lisp/allout.el (allout-get-configvar-values):
* lisp/org/org.el (org-display-inline-remove-overlay):
* lisp/progmodes/gdb-mi.el (gdb-get-location):
* lisp/progmodes/idlwave.el
(idlwave-convert-xml-clean-routine-aliases)
(idlwave-convert-xml-clean-sysvar-aliases):
* lisp/textmodes/reftex.el (reftex-ref-style-toggle):
Update the base variable after performing a destructive deletion,
where it was obvious that this was intended.

lisp/allout.el

@@ -6307,7 +6307,7 @@ not its value."
           (if (yes-or-no-p (format-message
 			    "%s entry `%s' is unbound -- remove it? "
 			    configvar-name sym))
-              (delq sym (symbol-value configvar-name)))
+              (set configvar-name (delq sym (symbol-value configvar-name))))
         (push (symbol-value sym) got)))
     (reverse got)))
 ;;;_  : Topics:

lisp/org/org.el

@@ -16422,7 +16422,7 @@ buffer boundaries with possible narrowing."
 (defun org-display-inline-remove-overlay (ov after _beg _end &optional _len)
   "Remove inline-display overlay if a corresponding region is modified."
   (when (and ov after)
-    (delete ov org-inline-image-overlays)
+    (setq org-inline-image-overlays (delete ov org-inline-image-overlays))
     ;; Clear image from cache to avoid image not updating upon
     ;; changing on disk.  See Emacs bug#59902.
     (when (overlay-get ov 'org-image-overlay)

lisp/progmodes/gdb-mi.el

@@ -3244,7 +3244,8 @@ Place breakpoint icon in its buffer."
       (if (re-search-forward gdb-source-file-regexp nil t)
           (progn
             (setq source-file (gdb-mi--c-string-from-string (match-string 1)))
-            (delete (cons bptno "File not found") gdb-location-alist)
+            (setq gdb-location-alist
+                  (delete (cons bptno "File not found") gdb-location-alist))
             (push (cons bptno source-file) gdb-location-alist))
         (gdb-resync)
         (unless (assoc bptno gdb-location-alist)

lisp/progmodes/idlwave.el

@@ -4653,7 +4653,7 @@ Gets set in cached XML rinfo, or `idlw-rinfo.el'.")
 	    (setcar alias (car x))
 	    (push alias idlwave-system-routines)))
     (cl-loop for x in remove-list do
-	  (delq x idlwave-system-routines))))
+	     (setq idlwave-system-routines (delq x idlwave-system-routines)))))
 
 (defun idlwave-convert-xml-clean-sysvar-aliases (aliases)
   ;; Duplicate and trim original routine aliases from rinfo list
@@ -4666,7 +4666,8 @@ Gets set in cached XML rinfo, or `idlw-rinfo.el'.")
 	    (setcar alias (car x))
 	    (push alias idlwave-system-variables-alist)))
     (cl-loop for x in remove-list do
-	  (delq x idlwave-system-variables-alist))))
+	     (setq idlwave-system-variables-alist
+                   (delq x idlwave-system-variables-alist)))))
 
 
 (defun idlwave-xml-create-sysvar-alist (xml-entry)

lisp/startup.el

@@ -837,12 +837,16 @@ It is the default value of the variable `top-level'."
     (let ((display (frame-parameter nil 'display)))
       ;; Be careful which DISPLAY to remove from process-environment: follow
       ;; the logic of `callproc.c'.
-      (if (stringp display) (setq display (concat "DISPLAY=" display))
-        (dolist (varval initial-environment)
-          (if (string-match "\\`DISPLAY=" varval)
-              (setq display varval))))
+      (if (stringp display)
+          (setq display (concat "DISPLAY=" display))
+        (let ((env initial-environment))
+          (while (and env (or (not (string-match "\\`DISPLAY=" (car env)))
+                              (progn
+                                (setq display (car env))
+                                nil)))
+            (setq env (cdr env)))))
       (when display
-        (delete display process-environment))))
+        (setq process-environment (delete display process-environment)))))
   (startup--honor-delayed-native-compilations))
 
 ;; Precompute the keyboard equivalents in the menu bar items.

lisp/textmodes/reftex.el

@@ -477,9 +477,9 @@ will deactivate it."
 		     changed t)
 	       (setq list (delete style list))))
 	    (t
-	     (if (member style list)
-		 (delete style list)
-	       (setq list (append list (list style))))
+             (setq list (if (member style list)
+		            (delete style list)
+                          (append list (list style))))
 	     (setq reftex-tables-dirty t
 		   changed t)))
       (when changed