ScreenSaver: Never inhibit the event message (reboot/poweroff), unless

specifically requested.

Using a custom message would effectively prevent the event message from
showing up, which is... bad.

(In fact, I'm half of the mind to get rid of the option to hide the
event messages, because it's a goddamned terrible idea).

frontend/ui/screensaver.lua

@@ -64,6 +64,18 @@ local Screensaver = {
         webp = true,
     },
     default_screensaver_message = _("Sleeping"),
+
+    -- State values
+    show_message = nil,
+    screensaver_type = nil,
+    prefix = nil,
+    event_message = nil,
+    overlay_message = nil,
+    screensaver_background = nil,
+    image = nil,
+    image_file = nil,
+    delayed_close = nil,
+    screensaver_widget = nil,
 }
 
 -- Remind emulator users that Power is bound to F2
@@ -446,7 +458,7 @@ function Screensaver:withBackground()
     return self.screensaver_background ~= "none"
 end
 
-function Screensaver:setup(event, fallback_message)
+function Screensaver:setup(event, event_message)
     self.show_message = G_reader_settings:isTrue("screensaver_show_message")
     self.screensaver_type = G_reader_settings:readSetting("screensaver_type")
     local screensaver_img_background = G_reader_settings:readSetting("screensaver_img_background")
@@ -454,16 +466,15 @@ function Screensaver:setup(event, fallback_message)
 
     -- These 2 (optional) parameters are to support poweroff and reboot actions on Kobo (c.f., UIManager)
     self.prefix = event and event .. "_" or "" -- "", "poweroff_" or "reboot_"
-    self.fallback_message = fallback_message
+    self.event_message = event_message
-    self.overlay_message = nil
     if G_reader_settings:has(self.prefix .. "screensaver_type") then
         self.screensaver_type = G_reader_settings:readSetting(self.prefix .. "screensaver_type")
     else
         if event and G_reader_settings:isFalse("screensaver_hide_fallback_msg") then
-            -- Display the provided fallback_message over the screensaver,
+            -- Display the provided event_message over the screensaver,
             -- so the user can distinguish between suspend (no overlay),
             -- and reboot/poweroff (overlaid message).
-            self.overlay_message = self.fallback_message
+            self.overlay_message = self.event_message
         end
     end
 
@@ -660,15 +671,21 @@ function Screensaver:show()
             screensaver_message = G_reader_settings:readSetting(self.prefix .. "screensaver_message")
         else
             if G_reader_settings:has("screensaver_message") then
-                -- We prefer the global user setting to the event's fallback message.
                 screensaver_message = G_reader_settings:readSetting("screensaver_message")
             else
-                screensaver_message = self.fallback_message or self.default_screensaver_message
+                -- In the absence of a custom message, use the event message if any, barring that, use the default message.
+                if self.event_message then
+                    screensaver_message = self.event_message
+                    -- The overlay is only ever populated with the event message, and we only want to show it once ;).
+                    self.overlay_message = nil
+                else
+                    screensaver_message = self.default_screensaver_message
+                end
             end
         end
         -- NOTE: Only attempt to expand if there are special characters in the message.
         if screensaver_message:find("%%") then
-            screensaver_message = self:expandSpecial(screensaver_message, self.fallback_message or self.default_screensaver_message)
+            screensaver_message = self:expandSpecial(screensaver_message, self.event_message or self.default_screensaver_message)
         end
 
         local message_pos
@@ -714,9 +731,6 @@ function Screensaver:show()
             }
         end
 
-        -- No overlay needed as we just displayed *a* message (not necessarily the event's, though).
-        self.overlay_message = nil
-
         -- Check if message_widget should be overlaid on another widget
         if message_widget then
             if widget then  -- We have a Screensaver widget
@@ -799,7 +813,7 @@ function Screensaver:cleanup()
     self.show_message = nil
     self.screensaver_type = nil
     self.prefix = nil
-    self.fallback_message = nil
+    self.event_message = nil
     self.overlay_message = nil
     self.screensaver_background = nil