experiment: blinking cursor

I've tried to keep the time period of the blinking similar to my
terminal.

Honestly I'm no longer sure if any of my experiments are showing a
statistically significant result. Let's see how it feels over a period
of time.

main.lua

@@ -82,6 +82,9 @@ Search_backup = nil  -- stuff to restore when cancelling search
 -- resize
 Last_resize_time = nil
 
+-- blinking cursor
+Cursor_time = 0
+
 end  -- App.initialize_globals
 
 function App.initialize(arg)
@@ -249,6 +252,7 @@ function App.draw()
 end
 
 function App.update(dt)
+  Cursor_time = Cursor_time + dt
   -- some hysteresis while resizing
   if Last_resize_time then
     if love.timer.getTime() - Last_resize_time < 0.1 then

text.lua

@@ -85,9 +85,12 @@ end
 --  draw with small line_width of 100
 
 function Text.draw_cursor(x, y)
-  love.graphics.setColor(1,0,0, 0.8)
-  love.graphics.rectangle('fill', x,y, 3,Line_height)
-  love.graphics.setColor(0,0,0)
+  -- blink every 0.5s
+  if math.floor(Cursor_time*2)%2 == 0 then
+    love.graphics.setColor(1,0,0)
+    love.graphics.rectangle('fill', x,y, 3,Line_height)
+    love.graphics.setColor(0,0,0)
+  end
   Cursor_x = x
   Cursor_y = y+Line_height
 end