[ComboTabBar] Fix some issues with pinned tabs,
- Fix height of 'm_pinnedTabBar' on first show
- Fix selecting and loading a tab after removing
  the tab that contains 'w' by blocking
  ComboTabBar::currentChanged().

- Also fixed GCC compile error and warnings.
{ComboTabBar] Don't use pointer to integer,

- I don't know what's going wrong with the old code and GCC but
  I changed tabBar(int*) to localTabBar(int) and issue was fixed.

- Also fixed an issue in TabNavigator::eventFilter()