gtk4: don't enable theme by default #7817
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Description
Don't enable the main GTK theme by default for GTK 4, as this uses an unsupported workaround and causes some issues, so it should be used with care and as an informed decision by the end user.
Also see #4770 (comment), #5133
Supersedes #5206
Checklist
Change is backwards compatible.
Code formatted with
nix fmt
ornix-shell -p treefmt nixfmt deadnix keep-sorted --run treefmt
.Code tested through
nix run .#tests -- test-all
ornix-shell --pure tests -A run.all
.Test cases updated/added. See example.
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If this PR adds a new module
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