[BACKPORT v4.4] A few Camera discovery fixes #12664
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This adds the logic we have in place for other camera requets already. We try to request it both using the old specific command as well as using the newer general MAV_CMD_REQUEST_MESSAGE command.
We have to try both commands, the deprecated specific one and the new generic one. We do this by calling the function twice. Also, we need to wait just a little bit in the "Basic" case because otherwise we seem to conflict with another MAV_CMD_REQUEST_MESSAGE and trigger a duplicate command request in which case the command is never sent out. This will need proper fixing in the underlying MAV_CMD_REQUEST_MESSAGE logic but for now this improves discovery of a camera, at least in my case.
We need to call factChanged initially, otherwise the ranges and exclusions are not taken into account when first displaying the camera settings UI. (They are taken into account on subsequent updates.)
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Backport of #12627.