If a single page is written to the wal file more than once, instead of appending...

FossilOrigin-Name: d493d4f1186c15da50558a13490cba0191e6f649

diff --cc manifest
index 7a565aecb30fc2ad1e042dcc3a69de979bf1ca75,975aaa75ce83a525217eb86b0036f821b008bac4..61584e65e46a507a5313fbbaf253397272af9c37
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Slightly\ssmaller\sand\sfaster\sLIKE/GLOB\scomparison\simplementation.
- D 2016-01-11T03:48:18.694
 -C Add\sa\stest\scase\sto\swaloverwrite.test\sto\scheck\sthat\ssavepoint\srollback\sdoes\snot\scause\sa\sproblem.
 -D 2016-01-11T08:12:40.471
++C If\sa\ssingle\spage\sis\swritten\sto\sthe\swal\sfile\smore\sthan\sonce,\sinstead\sof\sappending\sthe\ssecond\sand\ssubsequent\scopy\sto\sthe\swal\sfile,\soverwrite\sthe\sfirst.
++D 2016-01-11T12:13:47.299
  F Makefile.in 7c8cc4c2f0179efc6fa9492141d1fb65f4807054
  F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
  F Makefile.msc e45d8b9b56dfa3f2cd860b2c28bd9d304513b042
@@@ -1406,7 -1407,7 +1407,8 @@@ F tool/vdbe_profile.tcl 246d0da094856d7
  F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
  F tool/warnings.sh 48bd54594752d5be3337f12c72f28d2080cb630b
  F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
- P 52c166039831cc8423e2252019ef64a21b9d7c2a
- R b3c3f3b7322fc6b535d7f3bde12a066b
- U drh
- Z 4530f1ebb856a62f721161bd7860507a
 -P e83d3a2a4e06665e8a056f63063bd6df03f063b9
 -R 328bc4f1800dd81a2ef2edb5973d61be
++P 5dddcc78eec5bcd0c7e8fe1b70875ce775488f0c 87dae56c322454094d445e474ae36a4f464272a4
++R 52e14e84cadc34ac79ad50b8340775a5
++T +closed 87dae56c322454094d445e474ae36a4f464272a4
+ U dan
 -Z 271430cf4c8b2d1a2970f55a9b9d9220
++Z be438c4ccb03f7e22074fee8f0915a54

diff --cc manifest.uuid
index fe0beaab788145e99faa291ab854eb69c3158d51,a1ad7a192ad1d6d5315b1f58116cae2702f93ef3..5ee49b098d6d930b11e392372b99a59aab7b2a38
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 5dddcc78eec5bcd0c7e8fe1b70875ce775488f0c
 -87dae56c322454094d445e474ae36a4f464272a4
++d493d4f1186c15da50558a13490cba0191e6f649