[bug] searchbar: value of searchbar:search not correct

<f7-searchbar
  custom-search
  :backdrop="false"
  @searchbar:search="onSearch"
></f7-searchbar>

For some input methods (eg. Apple’s PINYIN in iOS), it will not give the correct value. I traced the request, if you want to search 苹果, whose pinyin is ‘pingguo’, it will send the following requests.

‘p’
‘pi’
‘ping’
‘pingg’,
‘pinggu’
‘pingguo’
‘苹果’
‘’

After sending the correct value ‘苹果’, it then sends another empty value.

I tested it with latest V 3.5.1.

Could be issue with such kind on input, i added new inputEvents parameter that can be set to something like change keyup compositionend that should track such more correctly