Lua: Discard vimade namespaces when switching colorscheme or backgrou…

…nd settings. This ensures that links stay in a good state.

lua/vimade/fader.lua

@@ -29,6 +29,10 @@ local update = function ()
     end
   end
 
+  if BIT_BAND(GLOBALS.tick_state, GLOBALS.DISCARD_NS) > 0 then
+    NAMESPACE.discard_all()
+  end
+
   if current.winid ~= -1 then
     WIN_STATE.refresh_active(current.winid)
   end
@@ -93,7 +97,7 @@ M.getInfo = function ()
 end
 
 M.redraw = function()
-  M.tick(BIT_BOR(GLOBALS.RECALCULATE, GLOBALS.CHANGED))
+  M.tick(BIT_BOR(GLOBALS.RECALCULATE, GLOBALS.DISCARD_NS, GLOBALS.CHANGED))
 end
 
 M.animate = function ()

lua/vimade/state/globals.lua

@@ -24,6 +24,7 @@ M.READY = 0
 M.ERROR = 1
 M.CHANGED = 2
 M.RECALCULATE = 4
+M.DISCARD_NS = 8
 -- some plugins (e.g. Neotree) add the highlights on window/buffer change. When nohlcheck,
 -- which prevents rechecking the namespaces for no reason, is enabled we tell the downstream
 -- logic to check namespaces on buf/win/tab change.
@@ -259,7 +260,7 @@ M.refresh = function (override_tick_state)
     is_dark = vim.go.background == 'dark',
     colorscheme = vim.g.colors_name,
     termguicolors = vim.go.termguicolors,
-  }, M, OTHER, BIT_BOR(M.RECALCULATE, M.CHANGED)))
+  }, M, OTHER, BIT_BOR(M.RECALCULATE, M.DISCARD_NS, M.CHANGED)))
   M.tick_state = BIT_BOR(M.tick_state, check_fields({
     'vimade_fade_active',
   }, {

lua/vimade/state/namespace.lua

@@ -30,7 +30,6 @@ M.clear_winid = function (winid, will_self_reuse)
   M.winid_lookup[winid] = nil
   if current_win_ns ~= nil then
     current_win_ns.windows[winid] = nil
-
     if next(current_win_ns.windows) == nil then
       M.key_lookup[current_win_ns.key] = nil
       M.vimade_active_ns_lookup[current_win_ns.vimade_ns] = nil
@@ -39,6 +38,16 @@ M.clear_winid = function (winid, will_self_reuse)
   end
 end
 
+-- This discards and uncaches all namespaces managed by vimade. This is useful
+-- when the namespace reaches an unrecoverable state (e.g. switching between some
+-- colorschemes may break the namespace link state).
+M.discard_all = function()
+  for winid, state in pairs(M.winid_lookup) do
+    M.clear_winid(winid)
+  end
+  M.free_ns = {}
+end
+
 M.get_replacement = function (win, real_ns, hi_key, skip_create)
   local key = hi_key