fix: only autohide UI when the cursor autohides (#771)

The cursor isn't allowed to autohide while hovering elements, so the UI
shouldn't autohide either. Otherwise this leads to the situation where
the UI autohides while e.g. hovering the timeline, and then the
cursor autohides afterwards because it's not hovering anything anymore.

src/uosc/lib/cursor.lua

@@ -32,13 +32,14 @@ local cursor = {
 	mbtn_left_dbl_enabled = nil,
 	mbtn_right_enabled = nil,
 	wheel_enabled = nil,
+	autohide_fs_only = nil,
 }
 
-cursor.autohide_timer = (function()
-	local timer = mp.add_timeout(mp.get_property_native('cursor-autohide') / 1000, function() cursor:autohide() end)
-	timer:kill()
-	return timer
-end)()
+cursor.autohide_timer = mp.add_timeout(1, function() cursor:autohide() end)
+cursor.autohide_timer:kill()
+mp.observe_property('cursor-autohide', 'number', function(_, val)
+	cursor.autohide_timer.timeout = (val or 1000) / 1000
+end)
 
 -- Called at the beginning of each render
 function cursor:clear_zones()
@@ -152,14 +153,17 @@ function cursor:decide_keybinds()
 	if enable_mbtn_left_dbl ~= self.mbtn_left_dbl_enabled then
 		mp[(enable_mbtn_left_dbl and 'enable' or 'disable') .. '_key_bindings']('mbtn_left_dbl')
 		self.mbtn_left_dbl_enabled = enable_mbtn_left_dbl
+		self:queue_autohide()
 	end
 	if enable_mbtn_right ~= self.mbtn_right_enabled then
 		mp[(enable_mbtn_right and 'enable' or 'disable') .. '_key_bindings']('mbtn_right')
 		self.mbtn_right_enabled = enable_mbtn_right
+		self:queue_autohide()
 	end
 	if enable_wheel ~= self.wheel_enabled then
 		mp[(enable_wheel and 'enable' or 'disable') .. '_key_bindings']('wheel')
 		self.wheel_enabled = enable_wheel
+		self:queue_autohide()
 	end
 end
 
@@ -253,13 +257,23 @@ end
 
 function cursor:leave() self:move(math.huge, math.huge) end
 
+function cursor:is_autohide_allowed()
+	return options.autohide and (not self.autohide_fs_only or state.fullscreen) and
+		not (self.mbtn_left_dbl_enabled or self.mbtn_right_enabled or self.wheel_enabled) and
+		not Menu:is_open()
+end
+mp.observe_property('cursor-autohide-fs-only', 'bool', function(_, val) cursor.autohide_fs_only = val end)
+
 -- Cursor auto-hiding after period of inactivity.
 function cursor:autohide()
-	if #self.zone_handlers.primary_up == 0 and not Menu:is_open() then self:leave() end
+	if self:is_autohide_allowed() then
+		self:leave()
+		self.autohide_timer:kill()
+	end
 end
 
 function cursor:queue_autohide()
-	if options.autohide and #self.zone_handlers.primary_up == 0 then
+	if self:is_autohide_allowed() then
 		self.autohide_timer:kill()
 		self.autohide_timer:resume()
 	end