draw_editor_border = function()
	App.color(Normal_color)
	local x1 = Current_pane.editor_state.left-5-Line_number_padding
	local y1 = Current_pane.editor_state.top-5
	local x2 = Current_pane.editor_state.right+5
	local y2 = Current_pane.editor_state.bottom+5
	-- upper border
	love.graphics.line(x1,y1, x2,y1)
	love.graphics.line(x1,y1, x1,y1+10)
	love.graphics.line(x2,y1, x2,y1+10)
	-- lower border
	love.graphics.line(x1,y2, x2,y2)
	love.graphics.line(x1,y2, x1,y2-10)
	love.graphics.line(x2,y2, x2,y2-10)
end