Fix [8e9d65d2d4]: Unexpected behavior of ttk::treeview with detached … #3417

Job	Run time
test (gcc)	3m 59s
build (gcc)	1m 44s
test (gcc, --disable-xft)	4m 2s
build (gcc, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 41s
test (gcc, --enable-symbols)	3m 31s
build (gcc, --disable-shared)	1m 39s
build (gcc, --disable-xft)	1m 43s
build (gcc, --disable-xss)	1m 39s
build (gcc, --enable-symbols)	1m 12s
build (clang)	1m 54s
build (clang, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 50s
build (clang, --disable-shared)	2m 18s
build (clang, --disable-xft)	1m 50s
build (clang, --disable-xss)	1m 59s
build (clang, --enable-symbols)	1m 24s
	32m 25s

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