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AtkActions:
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have names, descriptions, optional keybindings
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AtkComponent:
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ref_accessible_at_point can be tricky for widgets with
flyweight children
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AtkSelection:
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allows query and alteration of current selection
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AtkTable:
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complex interface
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point of interest: row and column headers can be objects
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AtkText:
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comprehensive access to attributed text content
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can be navigated by character, word, line, sentence,
attribute run
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allows read/write access to the text caret (including
labels, which feature a "virtual caret")
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text-change and caret signals must be emitted
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