On 2020-08-02, Roger Bell_West wrote:
> On 2020-08-02, bob prohaska wrote:
>>It therefore appears I want something like
>>Exec= MESA_EXTENSION_OVERRIDE=-GL_MESA_framebuffer_flip_y chromium-browser %U
>>in its place. I'm a little puzzled about the meaning of %U, however.
>
> Probably a placeholder in case you drag a file (or URL) onto that
> icon.

This, exactly. Just leave the %U in place, as you have done with your
example line above.

Just be aware that if you upgrade the Chromium package, this file will
be replaced and you'll have to make your changes again.

Another option would be to create your own .desktop file and place it in
/usr/share/applications or ~/.local/share/applications/ (if that local
location is supported by lxpanel)  with a different name like
'chromium-custom.desktop', and then change the line in wherever the
configfile lives in ~/.config/lxpanel/ to specify
chromium-custom.desktop as the .desktop file associated with the
Chromium panel launcher rather than chromium.desktop (or whatever it is
called).

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