readerannotation: fix pdf page bookmark conversion

frontend/apps/reader/modules/readerannotation.lua

@@ -26,6 +26,11 @@ function ReaderAnnotation:buildAnnotation(bm, highlights, init)
         end
         pageno = self.ui.paging and bm.page or self.document:getPageFromXPointer(bm.page)
     end
+    if self.ui.paging and bm.pos0 and not bm.pos0.page then
+        -- old single-page reflow highlights do not have page in position
+        bm.pos0.page = bm.page
+        bm.pos1.page = bm.page
+    end
     if not hl then -- page bookmark or orphaned bookmark
         hl = {}
         if bm.highlighted then -- orphaned bookmark
@@ -40,13 +45,6 @@ function ReaderAnnotation:buildAnnotation(bm, highlights, init)
             end
         end
     end
-    if self.ui.paging then
-        -- old single-page reflow highlights do not have page in position
-        if not bm.pos0.page then
-            bm.pos0.page = bm.page
-            bm.pos1.page = bm.page
-        end
-    end
     return { -- annotation
         datetime    = bm.datetime, -- creation time, not changeable
         drawer      = hl.drawer,   -- highlight drawer