Shortcuts don't trigger actions in some cases

QActions in top level menus with a shortcut consisting of a single key stroke (e.g. 'C') cannot be triggered by shortcut.

QActions in sub-menus with a shortcut consisting of a single or multiple key strokes (e.g. 'D,E' or 'F') cannot be triggered by shortcut.

Complete minimalistic example is attached.

• Start 'shortcut' binary
• Press 'A' key, then 'B' key -> 'Action triggered' is printed to stderr
• Press 'C' key -> Nothing happens ('Action triggered' should be printed to stderr)
• Press 'D' key, then 'E' key -> Nothing happens ('Action triggered' should be printed to stderr)
• Press 'F' key -> Nothing happens ('Action triggered' should be printed to stderr)