[log] spelling
[log] IDEA-121948 Possibly fix "row doesn't exist" exception

executeWithoutRepaint was called twice during setting filters: in the
runUnderModalThread & in applyGraphFilters.
However, the VcsLogGraphTable wasn't aware of such possibility => the
very first unfreeze unfreezed everything, although details filters
were not yet applied.

* Remove the unnecessary executeWithoutRepaint from applyGraphFilters.
* Make it possible to call executeWithoutRepaint several times: use a
  counter instead of a boolean.
[log] IDEA-115897 Call applyFilters() on onFieldCleared().

Unfortunately the native SearchTextField doesn't call this method if
the cross button is clicked, so this fix won't have any effect until
that issue is fixed.