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Merge from head@274682

IFC @r271694

Sync to HEAD@r270409.

Another rpund of fixes, after checking keymaps for plausibility and with
several updates to the converter tools. There is now support for hybrid
source keymaps, which e.g. use ISO8859-1 (not -15) but

Another rpund of fixes, after checking keymaps for plausibility and with
several updates to the converter tools. There is now support for hybrid
source keymaps, which e.g. use ISO8859-1 (not -15) but still provide an
Euro key (on the "E" key). ISO8859-1 currency symbols on other keys are
still converted to that character, not the Euro sign. A similar hack was
applied to the Japanese keyboards to add the Yen key, that could not be
expressed in SYSCONS.

Several modifications have been applied after the conversion (removal of
unused accents tables, some reformatting, exchange of a few key symbols).

The German keymap (de.kbd) is now using deadkeys only for those keys,
that behave that way under Windows. There are now ".acc" and ".noacc"
variants, which use deadkeys vs. nodeadkeys for all accent keys.

I'm still in the process of comparing keymaps that existed in different
encodings in SYSCONS. These are generally translated slightly differently,
either because of mistakes, or because of different preferences, or due
to limitations of the respective encoding.

MFC after: 3 days

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Fix conversion errors leading to malformed keymap files.

MFC after: 3 days

Attempt at converting the SYSCONS keymaps to Unicode for use with NEWCONS.
I have spent many hours comparing source and destination formats, and hope
to have caught the most severe conversion errors.

Attempt at converting the SYSCONS keymaps to Unicode for use with NEWCONS.
I have spent many hours comparing source and destination formats, and hope
to have caught the most severe conversion errors.

Files were converted with a Perl script which I'll shortly commit to the
tools directory. This script is a much enhanced version of the one
provided by ray@ and is expected to support the full kbdmap(5) syntax.

The naming convention used is:

<2-letter country code>.<variant>.kbd

Only if there are multiple layouts for different languages:

<2-letter country code>-<2-letter language code>.<variant>.kbd

In nearly all cases, the keyboards are country specific, only. Currently
there is only one case where the language was added ("ch-fr.kbd" for
the Swiss-French keyboard layout).

I choose to write Unicode character codes as hex numbers. While this
increases the diff to the SYSCONS keymap files for the trivial cases
(conversion from ISO8859-1), it really helps to verify the more complex
cases against a Unicode table (which is indexed by hex numbers).

This commit does not cover all files that have been converted, since I
need to sort out which ones to use, if there were several with different
source encodings to choose from.

Review and test of the keymap files is highly desirable before 10.1 is
released. I'd also appreciate educated opinions regarding the optimum
variant (to be made available as the default for each language).

Since there are no NEWCONS keymaps in 10-STABLE, I plan to MFC after
the minimum allowed delay of 3 days, to allow at least a few weeks to
test and improve what will be in the next release.

MFC after: 3 days

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