Better out of box smoothness and responsiveness (#357)

* Better out of box smoothness and responsiveness

This PR does various things to improve the out of the box editor
smoothness which includes:

* Adding new renwindow.get_refresh_rate method.
* Introduce new config.auto_fps flag to match the fps to current
  display refresh rate.
* Setting config.fps to match the display refresh rate by default.
* Emit displaychanged event to keep refresh rate updated.
* Allow smaller snap point on move_towards animation to reduce jittering.
* Reduce scroll rate from 0.3 to 0.2 for smoother scroll transition.
* Decrease garbage collection setpause to collect more often and
  in smaller sizes preventing big pauses, which should improve
  responsiveness.

Other Changes:

* Introduce new global DEFAULT_FPS to assist the settings gui when
  changing the config.auto_fps/fps flags.
* Revert default context lines from 10 to 1.
* Increase blink period from 0.8 seconds to 1.2 seconds which
  should be less distracting.
* Adjust run loop no-draw wait time
* Drop no longer necessary lower latency config
* Minor adjustment to code comment

Thanks to Amer for testing!

1 files changed, 28 insertions, 14 deletions

diff --git a/data/plugins/settings.lua b/data/plugins/settings.lua
index 9a33a9ba..f81f6820 100644
--- a/data/plugins/settings.lua
+++ b/data/plugins/settings.lua
@@ -263,13 +263,34 @@ settings.add("General",
 settings.add("Graphics",
   {
     {
+      label = "Auto FPS",
+      description = "Automatically set frames per second from current display refresh rate.",
+      path = "auto_fps",
+      type = settings.type.TOGGLE,
+      default = true,
+      on_apply = function(enabled)
+        if enabled then
+          config.fps = DEFAULT_FPS
+        else
+          config.fps = settings.config.fps or DEFAULT_FPS
+        end
+      end
+    },
+    {
       label = "Frames Per Second",
-      description = "Lower value for low end machines and higher for a smoother experience.",
+      description = "Lower value for low end machines and higher for a smoother experience. This value is ignored if Auto FPS is enabled.",
       path = "fps",
       type = settings.type.NUMBER,
-      default = 60,
+      default = core.window:get_refresh_rate() or 60,
       min = 10,
-      max = 300
+      max = 300,
+      on_apply = function(value)
+        if config.auto_fps then
+          config.fps = DEFAULT_FPS
+        else
+          config.fps = value
+        end
+      end
     },
     {
       label = "Transitions",
@@ -511,7 +532,7 @@ settings.add("User Interface",
       description = "Interval in seconds in which the cursor blinks.",
       path = "blink_period",
       type = settings.type.NUMBER,
-      default = 0.8,
+      default = 1.2,
       min = 0.3,
       max = 2.0,
       step = 0.1
@@ -610,7 +631,7 @@ settings.add("Editor",
       description = "Minimum number of lines to keep visible above and below the cursor when scrolling the document.",
       path = "scroll_context_lines",
       type = settings.type.NUMBER,
-      default = 10,
+      default = 1,
       min = 0,
       step = 1
     },
@@ -689,13 +710,6 @@ settings.add("Editor",
       path = "scroll_past_end",
       type = settings.type.TOGGLE,
       default = true
-    },
-    {
-      label = "Lower Input Latency",
-      description = "Reduce input latency by processing background tasks more aggressively, may use more CPU.",
-      path = "lower_input_latency",
-      type = settings.type.TOGGLE,
-      default = false
     }
   }
 )
@@ -825,7 +839,7 @@ settings.add("Advanced",
       description = "How many times ram has to increase after last clean in order to reclean. Lower value makes GC more aggressive but may cause stuttering. (Ignored on Lua 5.4+)",
       path = "gc_pause",
       type = settings.type.NUMBER,
-      default = 2,
+      default = 1.5,
       min = 1,
       max = 10,
       step = 0.1,
@@ -843,7 +857,7 @@ settings.add("Advanced",
       description = "How many times faster to run the collector in relation to allocations. Higher value makes GC more aggressive but may cause stuttering. (Ignored on Lua 5.4+)",
       path = "gc_step_multiplier",
       type = settings.type.NUMBER,
-      default = 2,
+      default = 1.5,
       min = 1,
       max = 10,
       step = 0.1,