Several little tweaks and fixes

- Fix scroll wheel in terrain area going beyond section boundaries
- Fix text not being drawn in dialog text fields when first activated
- Fix terrain being painted while scrolling the map to the east (especially with the keypad)
- Fix item or monster palette remaining active while editing outdoors
- When using a large brush, hilite all affected spaces

src/scenedit/scen.btnmg.cpp

@@ -13,7 +13,6 @@
 
 extern rectangle right_sbar_rect;
 
-rectangle left_button[NLS];
 extern rectangle right_buttons[NRSONPAGE];
 rectangle right_scrollbar_rect;
 extern short current_rs_top;