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Detail:
  * The pointer passed to Wimp_CommandWindow can now be top-bit-set.
  * Bugfix to Wimp_CommandWindow: if the current task was uninitialised,
    or initialised as a non-multitasking task, then although entering the
    CommandWindow would restore escape condition generation to the way it
    was before entering the desktop, exiting the CommandWindow did not
    reset escape condition generation to the default desktop state (which is
    for escape condition generation to be disabled).
  * Escape condition generation is disabled for the duration of SWI
    Wimp_ReportError (instead of setting the default escape key for the
    duration). The previous state is restored on exit.
  * Added a minimal environment for the service call
    Service_ErrorButtonPressed, so that claimants can call OS_Exit without
    leaving the global Wimp error box in an undefined state.
  * In the Wimp_Poll loop, if there are no events to deliver to any tasks
    (not even null events), then rather than sitting in a SVC mode loop,
    the Wimp now triggers transient callbacks. This is particularly
    important in order not to halt all activity in the Internet stack.
    The option LeaveOS can be set to make the Wimp use the as-yet
    unimplemented SWI OS_LeaveOS for this purpose; this is currently unset
    for all builds.
  * By (persistent) request, reinstated the old iconbar popping code,
    though it is currently a build switch that is turned off for all builds.
Admin:
  Tested on a Risc PC.

Version 4.69. Tagged as 'Wimp-4_69'

Detail:
  * Command line buffer for Wimp_StartTask (and anything that uses it,
    eg *WimpTask) increased from 256 bytes to 1024 bytes.
  * Top-bit-set message list pointers passed to Wimp_Initialise and
    Wimp_RemoveMessages now work (there was never a problem with
    Wimp_AddMessages!)
  * The fix for top-bit-set application name pointers in Wimp 4.65 actually
    only fixed lookup for "<application> may have gone wrong" lookups. They
    now work correctly in error window title construction, and when
    constructing an application sprite name if flag bit 8 is clear.
  * A pointer value of 0 is now accepted in addition to -1 for an
    "<application> may have gone wrong" lookup - this brings it into line
    with the other two places where the application name pointer is
    referenced.
  * When constructing an error window title, the Wimp would skip any leading
    backslash character. Now it does so when constructing "<application> may
    have gone wrong" too - this is a simple way to disable the application
    sprite in the error window.
Admin:
  Error box behaviour actually tested this time!

Version 4.67. Tagged as 'Wimp-4_67'

Detail:
  * Any top-bit-set sprite area pointer in a window definition was treated
    as a null pointer, and any top-bit-set program name pointer in
    Wimp_ReportError was similarly treated as a null pointer.
  * For 24-bit window colour builds, when the Wimp drew a title bar with
    the input focus, and there were sprite icons in the previously redrawn
    window, and the most recently plotted icon sprite was unpaletted and not
    selected or inverted, then the translation table for the icon sprite (in
    the RMA) would leak. I suppose that's what I get for re-using a bit of
    dead code without fully working out why it was bypassed in the first
    place...
  * The key handling code used to be over-eager to read bytes from the
    keyboard buffer: it would attempt to read up to 6 bytes ahead to ease
    the recognition of UTF-8 character sequences. This could cause problems,
    in particular if F12 was one of those 6 bytes, then any following bytes
    would be queued for use as Wimp keypresses, rather than being left in
    the keyboard buffer for use by ShellCLI. The Wimp now analyses the first
    byte read to make a sensible estimate of how many bytes it needs to read
    ahead.
  * Select-dragging (including Select-resizing) of windows with panes used
    to soak up all the processor time. This was because when the task
    received an Open_Window_Request, it would re-open the pane in front of
    the main window, but this would cause the Wimp to believe that it had to
    re-open the main window at the front of the stack again when Wimp_Poll
    was next called. The problem has been fixed so that the Wimp now
    examines all the windows in front of the drag window to see if they have
    the pane window flag bit set, and doesn't reshuffle the windows if they
    all do. (Actually, the test is performed such that foreground windows
    in front of the drag window are also ignored.)
Admin:
  Tested on a desktop machine.

Version 4.65. Tagged as 'Wimp-4_65'

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'

Detail:
  * New STB Sprites, Templates and Tools files imported, based upon the
    Lazarus UI rather than the old STB UI.
  * STB build now includes WIMPSymbol.
  * No longer attempts to use WIMPSymbol font in UTF8 builds which didn't
    register the font in ResourceFS.
  * Simplified Resources directories by assigning only a single pair of
    Messages files to each locale, rather than for each UI directory within
    each locale directory. The only code change required is to make the Wimp
    error box always use the "Continue" token for NC/STB builds, rather than
    using one of "OK" and "Continue", as with desktop builds.
Admin:
  Not tested.

Version 4.42. Tagged as 'Wimp-4_42'

Version 4.19. Tagged as 'Wimp-4_19'

Removed the code that restores the original pointer shape when leaving an error box (NCErrorBox conditional in Wimp07:finisherror).

This option is no longer necessary now that the Wimp_Extend support
ensures that the pointer appears and disappears as the user expects.

Version 4.17. Tagged as 'Wimp-4_17'

* If pointer was hidden-until-next-mouse-move, the act of confining the mouse
  to the error box window no longer causes it to be redisplayed.
* In error boxes, the pointer and the IconHigh highlight are now initially
  positioned over the rightmost (default) button. There is one exception to
  this rule: when "Next task" is clicked in a Watchdog window, the pointer
  stays over the "Next task" button.

Version 4.13. Tagged as 'Wimp-4_13'

  builds: now behaves like desktop builds (only detects button-down events).
* When mouse pointer is hidden following Wimp_Extend 12, changes of mouse
  button state will no longer cause the pointer to be reinstated.

Version 4.12. Tagged as 'Wimp-4_12'

Optimisation to new WimpSymbol substitution code: in icons containing fonts other than the desktop font, the substitution table is only calculated when a symbol character is encountered.

Embryonic cut-n-paste support introduced (currently in desktop builds only):
  * workspace is allocated and initialised;
  * extended Wimp_GetCaretPosition implemented;
  * pushfontstring adapted to allow insertion of arbitrary control sequences in
    font strings (to allow selected text to be plotted in inverted colours).
Inverted, unfilled text icons now work properly again in <256-colour modes.
Reworked NC error box code: see Doc.IconHigh.

Version 4.11. Tagged as 'Wimp-4_11'

Adapted assembly process so that the choice of Options file (previously based purely on the "System" variable) can be overridden by passing "OPTIONS=foo" as an argument to either MkRom, or to amu/amu_machine directly, or indirectly, by specifying it in the components file for a build. To accomplish this, it was necessary to switch from using aasm to objasm - hence the large number of source files affected in this commit.

Version 4.09. Tagged as 'Wimp-4_09'

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'

Version 4.02. Tagged as 'Wimp-4_02'

Changed to use srccommit.
All conditionals on "Version" removed.

Version 4.01. Tagged as 'Wimp-4_01'