Commit ee3eaf0c authored by Andy Holmes's avatar Andy Holmes

StAdjustment: note when 'changed' is not emitted

Like `GtkAdjustment`, `StAdjustment:changed` is not emitted for the
`value` property except when changed with `st_adjustment_set_values()`.

Note this behaviour in the signal documentation

closes #3147
parent 26a2e389
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