Move the class out of weld.hxx into its own header and source
file, in order to make it easier to keep an overview and to avoid
having to recompile ~all UI code when the class is
modified.
Change-Id: Ic47dac553fc065c5c9cddbf31e33012314dbe43d
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/199073
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>
Michael Weghorn
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