osc: make seek ranges rendering optional

This commit adds a new osc setting `seekranges` to control
the seek ranges visibility.

DOCS/man/osc.rst

@@ -272,6 +272,11 @@ Configurable Options
 
     Display timecodes with milliseconds
 
+``seekranges``
+    Default: yes
+
+    Display seekable ranges on the seekbar
+
 ``visibility``
     Default: auto (auto hide/show on mouse move)
 

player/lua/osc.lua

@@ -39,6 +39,7 @@ local user_opts = {
     tooltipborder = 1,          -- border of tooltip in bottom/topbar
     timetotal = false,          -- display total time instead of remaining time?
     timems = false,             -- display timecodes with milliseconds?
+    seekranges = true,          -- display seek ranges?
     visibility = "auto",        -- only used at init to set visibility_mode(...)
     boxmaxchars = 80,           -- title crop threshold for box layout
 }
@@ -1757,6 +1758,9 @@ function osc_init()
         end
     end
     ne.slider.seekRangesF = function()
+        if not (user_opts.seekranges) then
+            return nil
+        end
         local cache_state = mp.get_property_native("demuxer-cache-state", nil)
         if not cache_state then
             return nil