Excerpt from the fzf man page

# EXIT STATUS
         0      Normal exit
         1      No match
         2      Error
         126    Permission denied error from become action
         127    Invalid shell command for become action
         130    Interrupted with CTRL-C or ESC

We could modify the code to allow the ⎋ Escape key to be reassigned to another key combination, such as ⌃ Control + C (expanding #87).

diff --git a/gh-notify b/gh-notify
index cb3caff4928a..7b66d28fc8b1 100755
--- a/gh-notify
+++ b/gh-notify
@@ -40,6 +40,7 @@ GH_NOTIFY_PER_PAGE_LIMIT=50
 : "${GH_NOTIFY_VIEW_KEY:=enter}"
 : "${GH_NOTIFY_TOGGLE_PREVIEW_KEY:=tab}"
 : "${GH_NOTIFY_TOGGLE_HELP_KEY:=?}"
+: "${GH_NOTIFY_EXIT_KEY:=esc}"
 
 # Assign 'GH_NOTIFY_DEBUG_MODE' with 'true' to see more information
 : "${GH_NOTIFY_DEBUG_MODE:=false}"
@@ -164,7 +165,7 @@ ${WHITE_BOLD}Key Bindings fzf${NC}
   ${GREEN}${GH_NOTIFY_MARK_READ_KEY}   ${NC}  mark the selected notification as read and reload
   ${GREEN}${GH_NOTIFY_COMMENT_KEY}   ${NC}  write a comment with the editor and quit
   ${GREEN}${GH_NOTIFY_TOGGLE_KEY}   ${NC}  toggle the selected notification
-  ${GREEN}esc      ${NC}  quit
+  ${GREEN}${GH_NOTIFY_EXIT_KEY}      ${NC}  quit
 
 ${WHITE_BOLD}Table Format${NC}
   ${GREEN}unread symbol${NC}  indicates unread status
@@ -569,8 +570,8 @@ select_notif() {
             --color "header:green:italic:dim" \
             --color "prompt:80,info:40" \
             --delimiter '\s+' \
-            --expect "esc,${GH_NOTIFY_COMMENT_KEY}" \
-            --header "${GH_NOTIFY_TOGGLE_HELP_KEY} help · esc quit" \
+            --expect "${GH_NOTIFY_EXIT_KEY},${GH_NOTIFY_COMMENT_KEY}" \
+            --header "${GH_NOTIFY_TOGGLE_HELP_KEY} help · ${GH_NOTIFY_EXIT_KEY} quit" \
             --info=inline \
             --multi \
             --pointer="▶" \
@@ -590,13 +591,13 @@ select_notif() {
     # 2nd line: the selected line when the user pressed the key
     expected_key="$(command sed q <<<"$output")"
     selected_line="$(command sed '1d' <<<"$output")"
-    if [[ $(sed -n '$=' <<<"$selected_line") -gt 1 && $expected_key != "esc" ]]; then
+    if [[ $(sed -n '$=' <<<"$selected_line") -gt 1 && $expected_key != "${GH_NOTIFY_EXIT_KEY}" ]]; then
         die "Please select only one notification for this operation."
     fi
     IFS=' ' read -r _ thread_id thread_state _ repo_full_name _ _ _ _ type num _ <<<"$selected_line"
     [[ -z $type ]] && exit 0
     case "$expected_key" in
-        esc)
+        "${GH_NOTIFY_EXIT_KEY}")
             # quit with exit code 0; 'fzf' returns 130 by default
             exit 0
             ;;

Coupled with the GH_NOTIFY_FZF_OPTS assigned to ignore the ⎋ Escape key press, it would not exactly fulfill your request, but it would definitely make it more difficult to accidentally close the list.

GH_NOTIFY_FZF_OPTS="--bind 'esc:ignore'" GH_NOTIFY_EXIT_KEY="ctrl-c" gh notify -an 20

Confirm before exit #96

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