Fix blueprinted constructions over stairs

changelog.txt

@@ -38,6 +38,7 @@ Template for new versions:
 - `makeown`: halt any hostile jobs the unit may be engaged in, like kidnapping
 - `fix/loyaltycascade`: allow the fix to work on non-dwarven citizens
 - `control-panel`: fix setting numeric preferences from the commandline
+- `gui/quickfort`: fix build mode evluation rules to allow placement of various furniture and constructions on tiles with stair shapes or without orthagonal floor.
 
 ## Misc Improvements
 - `control-panel`: Add realistic-melting tweak to control-panel registry

internal/quickfort/build.lua

@@ -139,7 +139,7 @@ local function is_valid_tile_bridge(pos, db_entry, b)
             (dir == T_direction.Right and pos.x == b.pos.x+b.width-1) then
         return is_valid_tile_has_space(pos)
     end
-    return is_valid_tile_has_space_or_is_ramp(pos)
+    return is_valid_tile_machine(pos)
 end
 
 -- although vanilla allows constructions to be built on top of constructed
@@ -213,7 +213,7 @@ local function is_tile_coverable(pos)
              shape ~= df.tiletype_shape.STAIR_DOWN) then
         return false
     end
-    return is_tile_floor_adjacent(pos)
+    return true
 end
 
 --