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hugolib: Clear the page cache per render

This is a slight performance optimization with no functional effect.

See #5239

--- a/hugolib/pageCache.go

+++ b/hugolib/pageCache.go

@@ -44,6 +44,12 @@

 	return &pageCache{m: make(map[string][]pageCacheEntry)}

 }

+func (c *pageCache) clear() {

+	c.Lock()

+	defer c.Unlock()

+	c.m = make(map[string][]pageCacheEntry)

+}

+

 // get/getP gets a Pages slice from the cache matching the given key and

 // all the provided Pages slices.

 // If none found in cache, a copy of the first slice is created.

--- a/hugolib/site.go

+++ b/hugolib/site.go

@@ -1012,6 +1012,8 @@

 }

 func (s *Site) render(config *BuildCfg, outFormatIdx int) (err error) {

+	// Clear the global page cache.

+	spc.clear()

 	if outFormatIdx == 0 {

 		if err = s.preparePages(); err != nil {

@@ -1513,8 +1515,6 @@

 	s.futureCount = 0

 	s.expiredCount = 0

-

-	spc = newPageCache()

 	for _, p := range s.rawAllPages {

 		p.subSections = Pages{}