Merge pull request #2951 from myk002/myk_clear_tile

allow clearing of map interface layer tiles

docs/changelog.txt

@@ -47,6 +47,7 @@ changelog.txt uses a syntax similar to RST, with a few special sequences:
 - Gui focus strings will no longer get the "dfhack/" prefix if the string "dfhack/" already exists in the focus string
 
 ## Lua
+- ``dfhack.screen.paintTile()``: you can now explicitly clear the interface cursor from a map tile by passing ``0`` as the tile value
 - ``widgets.Label``: token ``tile`` properties can now be functions that return a value
 -@ ``gui.INTERIOR_FRAME``: a panel frame style for use in highlighting off interior areas of a UI
 

library/modules/Screen.cpp

@@ -130,7 +130,6 @@ static bool doSetTile_map(const Pen &pen, int x, int y) {
     long texpos = pen.tile;
     if (!texpos && pen.ch)
         texpos = init->font.large_font_texpos[(uint8_t)pen.ch];
-    if (texpos)
     vp->screentexpos_interface[index] = texpos;
     return true;
 }