Avoid removing imgbuf and decoding the whole image again for reloads.

Using the same testing files as the previous patch,
the results are:

.---------------------------------------------.
|imgbufs     | No patch | Patch #1 | Patch #2 |
|----------------------------------------------
|1imgA.html  |   2/1    |   1/1    |    1/0   |
|2imgSA.html |   3/2    |   1/2    |    1/0   |
|3imgSA.html |   4/3    |   1/3    |    1/0   |
|----------------------------------------------
|2imgA.html  |   4/2    |   2/2    |    2/0   |
|3imgA.html  |   6/3    |   3/3    |    3/0   |
'---------------------------------------------'

n1/n2 means:
  n1 imgbufs were created for first load (empty cache)
  n2 imgbufs were created for reload (cached image)

Notes:
 * Rendering is much faster. Easy to notice with Back operation.
 * Between four to five times on www.welt.de.
 * Corner cases can be more than ten times. Usually, it *feels* faster.

1 files changed, 0 insertions, 1 deletions

diff --git a/src/cache.c b/src/cache.c
index 04c8d356..6a7d2748 100644
--- a/src/cache.c
+++ b/src/cache.c
@@ -1258,7 +1258,6 @@ static CacheEntry_t *Cache_process_queue(CacheEntry_t *entry)
 
    /* Trigger cleanup when there are no cache clients */
    if (dList_length(ClientQueue) == 0) {
-      _MSG("  a_Dicache_cleanup()\n");
       a_Dicache_cleanup();
    }