Rewrote a lot of the components tree code:

- Added SF_PSELECTED for partially selected sub-sections
- SF_EXPAND now refreshes the components tree
- Fixed problems with sub-sections with RO sections as children
- (-1) sent to .onMouseOverSection when mouse over nothing
- RO sections can now be in InstTypes too (default to old behavior)
- Optimized code


git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@2436 212acab6-be3b-0410-9dea-997c60f758d6

Source/exehead/exec.c

@@ -1537,7 +1537,7 @@ static int NSISCALL ExecuteEntry(entry *entry_)
             if (parm1)
             {
               // update tree view
-              SendMessage(g_SectionHack,WM_USER+0x18,x,(LPARAM)(sec->flags&SF_SELECTED));
+              SendMessage(g_SectionHack,WM_USER+0x18,x,0);
             }
           }
         }