feat(ui-ext): make 'mousemoveevent' a ui_option

runtime/doc/ui.txt

@@ -207,6 +207,7 @@ the editor.
 	'guifontwide'
 	'linespace'
 	'mousefocus'
+	'mousemoveevent'
 	'pumblend'
 	'showtabline'
 	'termguicolors'

src/nvim/options.lua

@@ -1625,6 +1625,7 @@ return {
       full_name='mousemoveevent', abbreviation='mousemev',
       short_desc=N_("deliver mouse move events to input queue"),
       type='bool', scope={'global'},
+      redraw={'ui_option'},
       varname='p_mousemev',
       defaults={if_true=false}
     },

test/functional/ui/options_spec.lua

@@ -19,6 +19,7 @@ describe('UI receives option updates', function()
       linespace=0,
       pumblend=0,
       mousefocus=false,
+      mousemoveevent=false,
       showtabline=1,
       termguicolors=false,
       ttimeout=true,
@@ -131,6 +132,12 @@ describe('UI receives option updates', function()
       eq(expected, screen.options)
     end)
 
+    command("set mousemoveevent")
+    expected.mousemoveevent = true
+    screen:expect(function()
+      eq(expected, screen.options)
+    end)
+
     command("set nottimeout")
     expected.ttimeout = false
     screen:expect(function()