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Minor fixups as part of univeral !Boot work.
Options no longer ASSERT on International_Help (which is a definition exported by the kernel, rather than a build switch), and instead define a switch which is true for > 3.50.
Non UTF8 supporting case has simple substitutes for Wimp_TextOp.
Legacy_DomainId and LegacyIRQsema no longer cause NULL pointer dereference.
MOVeQ => MOVEQ to placate ObjAsm.

Ursula_RPC version built and used briefly on RISC OS 4.02 host. No other run time testing.

Version 5.22. Tagged as 'Wimp-5_22'

Detail:
  Lots of little changes throughout a lot of source.
Admin:
  Appears to work - not stress tested with things like lots of tasks, big
  transfers, and all the other things that tend to go wrong.

Version 4.47. Tagged as 'Wimp-4_47'

UTF-8 support from previous version switched in; additional alphabet- conditional support added as follows:

* Correctly converts character index returned from Font_FindCaret into byte
  index into raw string.
* Left-arrow, right-arrow, delete-left and delete-right now act as far as
  the next character boundary, instead of to the next byte.
* Menu item text justification works again (it relies on overwriting spaces
  with hard space characters, which are two-byte characters in UTF-8).
* General key handling code has been rewritten. The Wimp now has three
  internal key input buffers - one each for taking keyboard-generated,
  task-generated, and function-key-generated strings. Each input buffer is
  processed in chunks of one character, rather than one byte; malformed
  UTF-8 characters are rejected, so tasks don't have to worry about them
  (simplifying their character-handling code). There is also a key output
  buffer, to ensure that (UTF-8) sequences of Key_Pressed events are not
  broken up.
* As a result of the above, multiple calls to Wimp_ProcessKey are now
  possible between calls to Wimp_Poll. Previously, this resulted in bytes
  getting jumbled up - making it useless for input of UTF-8 characters.
* Multi-byte characters are inserted into writeable icons in one go, so you
  don't see a brief flicker of the "malformed character" symbol while the
  initial bytes are being inserted.
* Multi-byte characters that don't entirely fit in a writeable icon buffer
  are not inserted at all.
* A new validation string command ("U") can limit the contents of a
  writeable by number of characters, instead of bytes. This will hide the
  character sizes from the user interface.
* Allowable characters (validation string command "A") now works on Unicode
  characters and character ranges.
* Various other minor bugs are fixed (Wimp_ProcessKey 13 can activate a
  writeable menu item, Shift-arrow keys are always consistent in firing off
  Key_Pressed events, etc.)
* Password icons supported: one symbol is displayed for each character
  (instead of for each byte); the display character (validation string
  command "D") can be any UTF-8 character; correctly displays the caret
  after set-caret-by-index calls, even though characters in the processed
  string are different width to those in the raw string, in password icons.

Other changes:
* The border around NC-style error boxes is resized when the error window
  is grown or shrunk.
* Messages, CmdHelp and Template files made consistent across resource
  directories, including support for all Ursula features.
* ShrinkableAreas turned back on in System=RCA builds.
* User interface features of desktop OS builds standardised.

Version 4.06. Tagged as 'Wimp-4_06'

Made options files specify any text wanted after the module version number.
Auto-fronting iconbar now returns to previous position rather than back, so
it interacts with Shift+F12 better.