Allow painting fog and shroud terrains in the editor,

...as it should be useful for making masks

data/core/editor-groups.cfg

@@ -71,3 +71,9 @@
     name= _ "castle"
     icon="group_castle"
 [/editor_group]
+
+[editor_group]
+    id=special
+    name= _ "special"
+    icon="group_x"
+[/editor_group]

data/core/terrain.cfg

@@ -12,20 +12,25 @@
     id=off_map
     name= _ "None"
     string=_off^_usr    # wmllint: ignore
+	editor_group=special
 [/terrain]
 
 [terrain]
     symbol_image=void
+	editor_image=shroud-editor
     id=shroud
     name= _ "Shroud"
     string=_s       # wmllint: ignore
+	editor_group=special
 [/terrain]
 
 [terrain]
     symbol_image=fog
+	editor_image=fog-editor
     id=fog
     name= _ "Fog"
     string=_f       # wmllint: ignore
+	editor_group=special
 [/terrain]
 
 #
@@ -1091,7 +1096,7 @@
     name= _ "Void"
     string=Xv
     aliasof=Xt
-    editor_group=flat,wall
+    editor_group=flat,wall,special
 [/terrain]
 
 #

src/editor2/editor_palettes.cpp

@@ -72,11 +72,21 @@ terrain_palette::terrain_palette(display &gui, const size_specs &sizes,
 	, selected_fg_terrain_(fore)
 	, selected_bg_terrain_(back)
 {
-
 	// Get the available terrains temporary in terrains_
 	terrains_ = map_.get_terrain_list();
-	terrains_.erase(std::remove_if(terrains_.begin(), terrains_.end(), is_invalid_terrain),
-					terrains_.end());
+	
+	//move "invalid" terrains to the end 
+	size_t size = terrains_.size();
+	for (size_t i = 0; i < size; ++i) {
+		std::cerr << "C" << terrains_[i] << map_.get_terrain_string(terrains_[i]);
+		if (is_invalid_terrain(terrains_[i])) {
+			std::cerr << "Invalid" << map_.get_terrain_string(terrains_[i]);
+			terrains_.push_back(terrains_[i]);
+			terrains_.erase(terrains_.begin() + i);
+			size--;
+			i--;
+		}
+	}
 
 	// Get the available groups and add them to the structure
     const config::child_list& groups = cfg.get_children("editor_group");