fix(iv): Bug fix for iv window loosing focus on mac on startup (#4773)

Master version of the iv today when opening on mac sometimes opens
without a focus, which causes top menu bar not to be populated (just
`iv` on the left). Workaround is to switch back and forth once to and
from another app for menu bar too get populated.

It is unclear to me how reliably replicate the bug so that I have a
solid prove, that this fix works. But since building with this line it
never happened to me yet.

Maybe more knowledgeable in Qt can verify if it makes sense.

Signed-off-by: Aleksandr Motsjonov <soswow@gmail.com>

Author: soswow

src/iv/ivmain.cpp

@@ -138,6 +138,8 @@ main(int argc, char* argv[])
     if (ap["rawcolor"].get<int>())
         mainWin->rawcolor(true);
 
+    QApplication::processEvents();  // Process any pending events
+
     // Make sure we are the top window with the focus.
     mainWin->raise();
     mainWin->activateWindow();