Add theming to hide text cursor if no text is put in #709

Job	Run time
build-meson-clang	2m 5s
build-autotools-gcc	3m 32s
build-autotools-gcc-no-window	3m 52s
build-meson-gcc	1m 56s
build-autotools-clang	3m 30s
	14m 55s

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