Force full gui redraw on Ctrl+L

[llunak]

Summary

As is common with curses apps, this allows to redraw everything in case something corrupts the screen. Apparently key modifiers are difficult with curses (curses FAQ it "doesn't do that"), thankfully Ctrl+key are simply control characters, so it's (ascii & 037) => 12.

lldb/source/Core/IOHandlerCursesGUI.cpp

#endif
       } else {
         HandleCharResult key_result = m_window_sp->HandleChar(ch);
         switch (key_result) {
         case eKeyHandled:
           debugger.GetCommandInterpreter().UpdateExecutionContext(nullptr);
           update = true;
           break;
         case eKeyNotHandled:
+          if (ch == 12) { // Ctrl+L, force full redraw
+            redrawwin(m_window_sp->get());
+            update = true;
+          }
           break;
         case eQuitApplication:
           done = true;
           break;
         }
       }
     }