Channel Analysis: channel spans should respect regulatory domain limits #224
Description
On 2.4 GHz Channel Analysis, the displayed channel span for wider bandwidths doesn't account for regulatory domain restrictions.
Example: Channel 11 at 40 MHz width in the US shows a span of 7-14, but channel 14 is not available in the US (only Japan allows it, and only for 802.11b). The span should cap at 13 for US/most regulatory domains.
This likely affects any channel near the band edge where the calculated span would extend beyond what's actually permitted in the user's region.