Build

XAppIconChooserDialog: Subclass GtkDialog, not XAppGtkWindow. #126

Job	Run time
build / build (lmde7, linuxmintd/lmde7-amd64, LMDE 7, false) / LMDE 7	1m 53s
build / build (mint22, linuxmintd/mint22.3-amd64, Mint 22, true) / Mint 22	1m 39s
	3m 32s

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