Screen refresh between chapters (#3989)

frontend/apps/reader/modules/readertoc.lua

@@ -70,6 +70,16 @@ end
 
 function ReaderToc:onPageUpdate(pageno)
     self.pageno = pageno
+    if G_reader_settings:readSetting("full_refresh_count") == -1 then
+        if self:isChapterEnd(pageno, 0) then
+            self.chapter_refresh = true
+        elseif self:isChapterBegin(pageno, 0) and self.chapter_refresh then
+            UIManager:setDirty("all", "full")
+            self.chapter_refresh = false
+        else
+            self.chapter_refresh = false
+        end
+    end
 end
 
 function ReaderToc:onPosUpdate(pos, pageno)

frontend/ui/elements/refresh_menu_table.lua

@@ -67,5 +67,10 @@ return {
             callback = function() UIManager:setRefreshRate(custom_3()) end,
             hold_input = custom_input("refresh_rate_3")
         },
+        {
+            text = _("Every chapter"),
+            checked_func = function() return UIManager:getRefreshRate() == -1 end,
+            callback = function() UIManager:setRefreshRate(-1) end,
+        },
     }
 }