Is there any way to change how Geany highlights a misspelled word? At least make those red squiggly underlines a lot bolder? Or, better still, switch background color? Those lines are barely visible on my system.
I'm afraid you can't change anything but the color. AFAIK it uses Geany's *error indicator*, that is the colorscheme's `indicator_error`, see https://www.geany.org/manual/#id4
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