select-adjacent-tab

Arguments: (tab-control tab-control) rightward

Selects the tab of tab-control (which must be a tab-control) that is immediately to the left or right of the currently selected tab. This method would typically be called by keyboard shortcuts for selecting nearby tabs (as seen in some IDE dialogs when right-clicking a tab).

If rightward is true, then the tab on the right is selected, and otherwise the tab on the left is selected. If there are no further tabs in the indicated direction, then nothing is done.

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Created 2012.5.30.