Bug report: SIGSEGV when copying cross-reference from "description" layout on LyX 2.4.0 beta 5

[Jürgen Spitzmüller]

Am Freitag, dem 15.09.2023 um 10:45 +0200 schrieb Léo de Souza:
> 1. Create new document: File > New
> 2. Insert label: Insert > Label...
> 3. On a new line, switch layout to "Labeling" or "Description"
> 4. Insert cross-reference: Insert > Cross-Reference...
> 5. Try copying this cross-reference
> 
> Expected result (LyX 2.3.6): The cross-reference is copied to the
> clipboard.
> 
> Actual result (LyX 2.4.0 beta 5): LyX crashes with the message
> "SIGSEGV signal caught!"


Nullpointer issue due to local_font being non-defined in
InsetRef::xhtml().

The attached patch fixes this particular case, but there are many
similar uses in insets's xhtml methods which would need to be audited.

Thibaut, Riki?

-- 
Jürgen
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