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Sliders were exposed as `android.widget.SeekBar` with range info, but nothing allowed an assistive technology to change their value. TalkBack's "adjust slider" reading control only ever performs `ACTION_SCROLL_FORWARD` and `ACTION_SCROLL_BACKWARD` (see `NumberAdjustor` in its source), which the framework's own `SeekBar` also uses, so expose them for nodes supporting `Increment` and `Decrement` and map them to those actions rather than to scrolling. Also expose `ACTION_SET_PROGRESS` for nodes that support `SetValue` on a numeric range, and map it to `SetValue` with a numeric value. A native `SeekBar` isn't clickable, so on double-tap TalkBack falls back to synthesizing a tap at the center of the control, which is how users jump to the middle of the range. Don't add the focus-only `ACTION_CLICK` to such controls so the first double-tap behaves the same way. Finally, skip the accessibility-enabled JNI check when raising an empty set of events, as happens for actions that are handled but produce their events through a later tree update.
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