interpret shrubbery as floor instead of wall

docs/changelog.txt

@@ -36,7 +36,8 @@ changelog.txt uses a syntax similar to RST, with a few special sequences:
 ## New Plugins
 
 ## Fixes
-- Steam launcher now launches Dwarf Fortress via the Steam client
+- ``launchdf``: launch Dwarf Fortress via the Steam client so Steam Workshop is functional
+- `blueprint`: interpret saplings, shrubs, and twigs as floors instead of walls
 
 ## Misc Improvements
 

plugins/blueprint.cpp

@@ -229,6 +229,9 @@ static const char * get_tile_dig(const df::coord &pos, const tile_context &) {
     case tiletype_shape::BOULDER:
     case tiletype_shape::PEBBLES:
     case tiletype_shape::BROOK_TOP:
+    case tiletype_shape::SAPLING:
+    case tiletype_shape::SHRUB:
+    case tiletype_shape::TWIG:
         return "d";
     case tiletype_shape::STAIR_UP:
         return "u";