fix: filter_map_bool_then
suggest wrongly when the closure cannot be decompose directly
#14370
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Closes #11617
Closes #14368
Clippy gives wrong suggestions when the filter and then cannot be put into closure directly. Since trying to transform these can be too complicated, Clippy will simply warn but don't try to fix.
changelog: [
filter_map_bool_then
]: fix wrong suggestions when the closure cannot be decompose directly