linting: when no is said to a file, remove all corresponding entries

When the user chooses not to open a file that some message refers to,
remove all messages for that file from the linting results, so the user
does not get asked about that same file again.

This fixes https://savannah.gnu.org/bugs/?47130.

src/text.c

@@ -3267,15 +3267,39 @@ void do_linter(void)
 			    SET(MULTIBUFFER);
 			    open_buffer(curlint->filename, FALSE);
 			} else {
-			    char *dontwantfile = curlint->filename;
+			    char *dontwantfile = mallocstrcpy(NULL, curlint->filename);
+			    lintstruct *restlint = NULL;
 
-			    while (curlint != NULL && !strcmp(curlint->filename, dontwantfile))
-				curlint = curlint->next;
-			    if (curlint == NULL) {
+			    while (curlint != NULL) {
+				if (strcmp(curlint->filename, dontwantfile) == 0) {
+				    if (curlint == lints)
+					lints = curlint->next;
+				    else
+					curlint->prev->next = curlint->next;
+				    if (curlint->next != NULL)
+					curlint->next->prev = curlint->prev;
+				    tmplint = curlint;
+				    curlint = curlint->next;
+				    free(tmplint->msg);
+				    free(tmplint->filename);
+				    free(tmplint);
+				} else {
+				    if (restlint == NULL)
+					restlint = curlint;
+				    curlint = curlint->next;
+				}
+			    }
+
+			    if (restlint == NULL) {
 				statusbar(_("No more errors in unopened files, cancelling"));
+				napms(2400);
 				break;
-			    } else
+			    } else {
+				curlint = restlint;
 				goto new_lint_loop;
+			    }
+
+			    free(dontwantfile);
 			}
 		    } else
 			openfile = tmpof;