filemanagerutil: add multiple collections

frontend/apps/filemanager/filemanagerutil.lua

@@ -235,20 +235,13 @@ function filemanagerutil.genResetSettingsButton(doc_settings_or_file, caller_cal
 end
 
 function filemanagerutil.genAddRemoveFavoritesButton(file, caller_callback, button_disabled)
-    local ReadCollection = require("readcollection")
-    local has_file = ReadCollection:hasFile(file)
     return {
-        text_func = function()
-            return has_file and _("Remove from favorites") or _("Add to favorites")
-        end,
+        text = _("Book in collections"),
         enabled = not button_disabled,
         callback = function()
             caller_callback()
-            if has_file then
-                ReadCollection:removeItem(file)
-            else
-                ReadCollection:addItem(file)
-            end
+            local ui = require("apps/filemanager/filemanager").instance or require("apps/reader/readerui").instance
+            ui.collections:onShowCollList(file)
         end,
     }
 end