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used for TK_OPTION_CUSTOM, and typedef's of the functions
Tk_CustomOptionSetProc, Tk_CustomOptionGetProc,
Tk_CustomOptionRestoreProc, and Tk_CustomOptionFreeProc, used for
TK_OPTION_CUSTOM.
* doc/SetOptions.3: Added documentation of TK_OPTION_CUSTOM, and
section "CUSTOM OPTION TYPES" explaining how to create and use
custom options.
* tests/config.test: Added tests for custom option type.
* generic/tkTest.c: Added test support for TK_OPTION_CUSTOM to
TestobjconfigObjCmd. Added CustomOption* functions to implement a
test custom option.
* generic/tkConfig.c: Added new option type TK_OPTION_CUSTOM,
which allows the definition of custom option types by creating
parsing, printing, freeing, and restoring procedures for a custom
option. This is needed by the text and canvas widgets if they are
to be fully objectified.
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