Rockbox

Revision 19442, should apply to all targets with an FM tuner

This is a set of fixes for the presets list in the FM tuner. The issues I found and fixed are:

* presets list does not scroll horizontally properly (due to the list_do_action() repeatedly timing out after 1 second)
* when returning from the presets list to the main radio screen, the highlighted item in the list scrolls on main radio screen (if it's too wide for the screen, that is)
* when adding a preset while in the presets list (with ACTION_FM_PRESET) the list is not updated with the new preset
* when clearing presets (or deleting the last preset), the main screen still shows the same preset number
* when deleting a preset, the current preset number doesn't change if it's past the end of the list (this is partially related to the previous issue)
* the find_closest_preset() routine could be improved to actually find the closest frequency that is saved as a preset
* inputting a preset name could be optimized in both time and space (especially in radio_add_preset()); also the length parameter to kbd_input() includes the null terminator, so I added one to those arguments

 recorder/radio.c |   77 +++++++++++++++++++++++++++++++++++++------------------
 1 file changed, 52 insertions(+), 25 deletions(-)