Ever since LyX was upgraded to v. 2.3.1 the rendering of math superscripts
changed.
Using a ABNT (brazilian) keyboard map, which provides accents (acute,
grave, circumflex, cedilla, etc) as dead keys, up to the previous version
(2.3.0), whenever I wanted a superscript in math mode I would use the
circumflex accent key.  That would have the same effect as the key-binding
Alt+M E, both in LyX math mode and in LaTeX.
Now, since v. 2.3.1 was installed, if I want to renderize $a^2$, for
instance, in LyX math, it will display literally a^2.  After exiting math
mode and with instant preview active, the LaTeX rendition will display the
correct format.

Subscripts are still rendered either with Alt+M X  or with "_"
(underscore), as it was always done.

This is not something terribly annoying, but with an ABNT keyboard it is
much faster to employ the single "^" key than pressing the 3 keys Alt + M +
E.

-- 

Rudi Gaelzer

Institute of Physics

Federal University of Rio Grande do Sul

BRAZIL

Registered linux user # 153741

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