ci: count the prepared channel's subscriber lines by pattern, and close the desktop result menu with a click

The first desktop run showed "2 subscribers" in the toolbar and the banner, which the check counting "1 subscriber" missed, and Escape doesn't close the chat list's menus on desktop.

Run: 011-search-redesign, slice 4 (feature CI fix)

scripts/ci/desktop-linux/smoke-test.sh

@@ -353,7 +353,8 @@ no_consent_alert() {
   ! "$ui" find "Enable Directory search" > /dev/null 2>&1
 }
 
-# A right click on a result opens its menu, which offers Open; Escape closes it.
+# A right click on a result opens its menu, which offers Open; a click elsewhere closes it (Escape doesn't close the
+# chat list's menus on desktop).
 result_menu() {
   local layout=$1 pos opens
   pos=$(left_pane_position "#ci_group") || { check "$layout: #ci_group shown for its menu" false; return; }
@@ -361,9 +362,9 @@ result_menu() {
   "$ui" right-click "${pos% *}" "${pos#* }"
   check "$layout: a right click on #ci_group opens a menu with \"Open\"" [ "$(count_phrases all Open)" -gt "$opens" ]
   "$ui" shot "$layout-result-menu"
-  "$ui" key Escape
+  "$ui" click 900 450
   sleep 1
-  check "$layout: Escape closes the result's menu" [ "$(count_phrases all Open)" -eq "$opens" ]
+  check "$layout: a click elsewhere closes the result's menu" [ "$(count_phrases all Open)" -eq "$opens" ]
 }
 
 # Searches the directory for the text in the search field with the "Search in Directory" row; the first search
@@ -513,7 +514,12 @@ wait_prepared_channel() {
       alert_shown=true
     fi
     if grep -qiF "tap join channel" <<< "$screen"; then
-      prepared_subscribers=$(count_phrases right "1 subscriber")
+      local line
+      while IFS= read -r line; do
+        if [ "${line%%,*}" -ge 390 ] && grep -qiE '[0-9]+ subscribers?' <<< "$line"; then
+          prepared_subscribers=$((prepared_subscribers + 1))
+        fi
+      done <<< "$screen"
       return 0
     fi
     [ "$SECONDS" -lt "$deadline" ] || return 1