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Only use menu_int after checking it's not NULL. Fixes problems in !ResTest when opening menus with menu class items in them.

Version 0.40. Tagged as 'Menu-0_40'

Detail:
  c/getstate - Fix null pointer dereference if Toolbox_GetObjectState is called for a menu when there aren't any menus visible
  c/hide - Fix similar null pointer dereference in Toolbox_HideObject handling
Admin:
  Builds, untested
  Based on fix suggested by Colin Granville:
  https://www.riscosopen.org/forum/forums/1/topics/3637/?page=2#posts-46674


Version 0.39. Tagged as 'Menu-0_39'

No headers to export (they're in tboxlibs), state this explicitly.
Retagged.

Include paths changed to Unix style.
Debug and non debug CMHG definitions replaced by one which is selected by passing predefines to CMHG.
Removed dummy services.h.
Don't bother calling TinyStubs SWI since in ROM it does nothing, and the RAM versions haven't used it since ~1997.
Use module header constants generated from CMHG rather than hand made one.
Reject out of range SWIs (fixes ticket #305).

Version 0.38. Tagged as 'Menu-0_38'

Detail:
  c/events - event_help_request was dereferencing global_menu.top before checking if it was null, leading to a crash if no menu was active at the time of the request.
Admin:
  Tested on BB-xM with high processor vectors


Version 0.37. Tagged as 'Menu-0_37'

  Debug build facility added.
Detail:
  Uses core facilities from Common instead of having private copies.
  Makefile vastly simplified to simply define a few macros, then include
    the common Toolbox Makefile which is exported by Common.
Admin:
  Requires Common 0.09 or later (RiscOS/Sources/Toolbox/Common; Common-0_09)
  Requires BuildSys 1.92 or later (RiscOS/BuildSys; BuildSys-1_92)
  Requires Library 0.41 or later (RiscOS/Library; Library-0_41)

Version 0.36. Tagged as 'Menu-0_36'

Version 0.35. Tagged as 'Menu-0_35'

  CMHG invocation flags include -p required for srccommit.
Detail:
  c.miscop:640, menu_remove_entry(): call make_error_hex instead of
  make_error so that the component ID is translated to a string.
  Makefile: CMHG rule now has -p so cmhg runs it through C preprocessor.
Admin:
  RAM load version built and verified that fault no longer occurs.
  CVS tag: Menu-0_34

Version 0.34. Tagged as 'Menu-0_34'

RISC OS 3.7 and Ursula due to a bad NULL pointer usage in c.auxiliary.
This is now fixed so that an empty menu item is displayed.

Module version number incremented and date-string updated to give
a uniform set of dates for final Expresso build.

Explicit date declaration now in CMHG header file.

  !MkRam,fd7 added to enable RAM builds of all Toolbox modules
  MakeFile tidied up and support for RAM build added
Module now uses Toolbox memory allocation instead of calling OS_Module.

* Standardised make process in common will all other modules in build.
* Internal and external toolbox libraries and headers exported to
  <Lib$Dir>.tboxlibint and <Lib$Dir>.tboxlibs respectivly.
* Resources now localised.
* Local !MkClean and !MkRom now use amu_machine.

Sprout from master 1996-11-05 09:22:41 UTC Neil Turton <nturton@gitlab.riscosopen.org> 'Import from cleaned 360 CD'
Delete:
    MakeROM,fe1
    MakeRel,fe1
    Makefile,fe1