Fix default value of visualizer_spectrum_dft_size

doc/config

@@ -95,7 +95,7 @@
 #visualizer_color = 41, 83, 119, 155, 185, 215, 209, 203, 197, 161
 #
 ##
-## Note: The next few visualization options apply to the spectrum visualizer
+## Note: The next few visualization options apply to the spectrum visualizer.
 ##
 #
 ## Use unicode block characters for a smoother, more continuous look.
@@ -105,8 +105,8 @@
 #
 #visualizer_spectrum_smooth_look = yes
 #
-## A value between 0 and 5 inclusive. Specifying a larger value makes the
-## visualizer look at a larger slice of time, which results less jumpy
+## A value between 0 and 4 inclusive. Specifying a larger value makes the
+## visualizer look at a larger slice of time, which results in less jumpy
 ## visualizer output.
 #
 #visualizer_spectrum_dft_size = 2

doc/ncmpcpp.1

@@ -106,7 +106,7 @@ Automatically scale visualizer size.
 For spectrum visualizer, use unicode block characters for a smoother, more continuous look. This will override the visualizer_look option. With transparent terminals and visualizer_in_stereo set, artifacts may be visible on the bottom half of the visualization.
 .TP
 .B visualizer_spectrum_dft_size = NUMBER
-For spectrum visualizer, a value between 0 and 5 inclusive. Specifying a larger value makes the visualizer look at a larger slice of time, which results less jumpy visualizer output.
+For spectrum visualizer, a value between 0 and 4 inclusive. Specifying a larger value makes the visualizer look at a larger slice of time, which results in less jumpy visualizer output.
 .TP
 .B visualizer_spectrum_hz_min = Hz
 For spectrum visualizer, left-most frequency of visualizer, must be less than HZ MAX.

src/settings.cpp

@@ -294,10 +294,10 @@ bool Configuration::read(const std::vector<std::string> &config_paths, bool igno
 	p.add("visualizer_autoscale", &visualizer_autoscale, "yes", yes_no);
 	p.add("visualizer_spectrum_smooth_look", &visualizer_spectrum_smooth_look, "yes", yes_no);
 	p.add("visualizer_spectrum_dft_size", &visualizer_spectrum_dft_size,
-			"12", [](std::string v) {
+			"2", [](std::string v) {
       uint32_t result = verbose_lexical_cast<uint32_t>(v);
-      boundsCheck<uint32_t>(result, 0, 5);
-			return result + 12;
+      boundsCheck<uint32_t>(result, 0, 4);
+			return result + 14;
 			});
 	p.add("visualizer_spectrum_hz_min", &visualizer_spectrum_hz_min,
 			"20", [](std::string v) {