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Fix FindOKMode not recovering properly from unsupported VIDC lists
Jeffrey Lee authored 
Detail:
  s/vdu/vduswis - Fix 18 year old register corruption bug in FindOKMode which would prevent it from falling back to Service_ModeTranslation if Service_ModeExtension returned a VIDC list but the VIDC list was rejected by the GraphicsV driver
  s/vdu/vdudriver - Also, change a couple of error cases in ModeChangeSub so that they use the "Screen mode not available" error instead of the incorrect "Not enough screen memory" error.
Admin:
  Tested on Raspberry Pi 3
  Fixes issue reported on forums where if AnyMode is loaded, numbered modes in unsupported colour depths weren't being replaced with substitutes (although note that there are still some AnyMode-related issues to resolve)
  https://www.riscosopen.org/forum/forums/4/topics/12773


Version 6.16. Tagged as 'Kernel-6_16'
6f366d87
Name Last commit Last update
Dev Delete lots of old switches
Doc Kernel merged
Docs Initial SMP changes
Resources/UK Add support for shareable pages and additional access privileges
TestSrc Delete pre-HAL and 26bit code
h Header defs for Pi Compute module and IIC
hdr Attempt to tidy up substitute screen mode selection logic
o Clean reimport of hdr.RISCOS (real commit date 2008-03-28 by bavison), without any of the 3rd party allocations.
rm Clean reimport of hdr.RISCOS (real commit date 2008-03-28 by bavison), without any of the 3rd party allocations.
s Fix FindOKMode not recovering properly from unsupported VIDC lists
.gitattributes Added 'UnConv' error (see also HdrSrc).
BlackLog Initial revision
Changes Import from cleaned 360 CD
HelpStrs Adoption of *CONFIGURE/STATUS CACHE commands
LICENSE Clean reimport of hdr.RISCOS (real commit date 2008-03-28 by bavison), without any of the 3rd party allocations.
Makefile Merge in latest changes from main branch
MkClean,fd7 Mostly device stuff.
MkExport,fd7 Import from cleaned 360 CD
MkInstall,fd7 Added a disc install phase as an analogue of the export phase
MkRom,fd7 Makefile recreated from fragments
Version Nightly beta builds leapfrog RISC OS 5.26
VersionASM Fix FindOKMode not recovering properly from unsupported VIDC lists
VersionNum Fix FindOKMode not recovering properly from unsupported VIDC lists