Stricter enforcement of the idea that a MATERIALIZED common table expression

is an optimization fence.

FossilOrigin-Name: 354425f8d97437bd156265a6914f98cce91b42abc9e773453ef4d817e308dc9a

diff --cc manifest
index 6111b6307677f71735a66a94483ee6302e66177d,4664e580ebcdda3a5ef2b24c3ec01737504c6dff..2478f35d9b3961e2c5070747a76d20f4e52a19f7
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Avoid\sASAN\swarnings\swhen\sconverting\sover-sized\slong\sdouble\svalues\sinto\sdouble.
- D 2023-08-01T19:10:30.602
 -C Remove\sa\scondition\sfrom\squery\sflattening\sthat\sis\snow\staken\scare\sof\sby\nthe\scaller.\s\sFactor\sout\sthe\sreverse_unordered_selects\sprocessing\sfrom\sthe\nmain\sloop\sof\ssqlite3WhereBegin()\sfor\sperformance.
 -D 2023-08-02T13:29:01.398
++C Stricter\senforcement\sof\sthe\sidea\sthat\sa\sMATERIALIZED\scommon\stable\sexpression\nis\san\soptimization\sfence.
++D 2023-08-02T13:38:02.621
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@@ -2049,8 -2049,8 +2049,9 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
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  U drh
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  # Remove this line to create a well-formed Fossil manifest.

diff --cc manifest.uuid
index feb55dd783e99767375349a31ba84968705e62a5,bed6656874e872ba73456c783ede2a7841101851..d936b03fc8bd45e699cacaefc07330cab853a631
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- e989a37ff9d5b52e0090d59be077ad2260c8df5d4c2c2d8088b1160de64dffd4
 -f068f105fb158634321bf6401f0774c81059932d213a18b627ae98bcffc10912
++354425f8d97437bd156265a6914f98cce91b42abc9e773453ef4d817e308dc9a