change _debug to _syslog

sys/apis/terminal.lua

@@ -100,9 +100,9 @@ function Terminal.window(parent, sx, sy, w, h, isVisible)
 	end
 
 	function win.setCursorPos(x, y)
-		cx, cy = x, y
+		cx, cy = math.floor(x), math.floor(y)
 		if isVisible then
-			parent.setCursorPos(x + canvas.x - 1, y + canvas.y - 1)
+			parent.setCursorPos(cx + canvas.x - 1, cy + canvas.y - 1)
 		end
 	end
 

sys/apis/trace.lua

@@ -85,7 +85,7 @@ return function (fn, ...)
     end
 
     for _, line in pairs(trace) do
-      _G._debug(line)
+      _G._syslog(line)
     end
 
     -- If this traceback is more than 15 elements long, keep the first 9, last 5

sys/apis/ui/canvas.lua

@@ -199,13 +199,15 @@ function Canvas:blit(x, y, text, bg, fg)
 			end
 
 			local line = self.lines[y]
-			line.dirty = true
-			line.text = replace(line.text, x, text, width)
-			if fg then
-				line.fg = replace(line.fg, x, fg, width)
-			end
-			if bg then
-				line.bg = replace(line.bg, x, bg, width)
+			if line then
+				line.dirty = true
+				line.text = replace(line.text, x, text, width)
+				if fg then
+					line.fg = replace(line.fg, x, fg, width)
+				end
+				if bg then
+					line.bg = replace(line.bg, x, bg, width)
+				end
 			end
 		end
 	end