Make clearstl more robust with lualine

See #51

Author: vimpostor

autoload/tpipeline.vim

@@ -35,6 +35,7 @@ func tpipeline#build_hooks()
 		if empty(g:tpipeline_statusline) && !g:tpipeline_tabline
 			if tpipeline#lualine#is_lualine()
 				au OptionSet statusline call tpipeline#lualine#delay_eval()
+				au ModeChanged * call tpipeline#lualine#delay_eval()
 			elseif g:tpipeline_clearstl
 				au OptionSet statusline if v:option_type == 'global' | call tpipeline#util#clear_stl() | endif
 			endif

autoload/tpipeline/lualine.vim

@@ -10,7 +10,11 @@ func tpipeline#lualine#clear_all_stl()
 endfunc
 
 func tpipeline#lualine#fix_stl()
-	noa let g:tpipeline_statusline = getwinvar(win_getid(), '&stl')
+	noa let s = getwinvar(win_getid(), '&stl')
+	if !empty(s) && s !=# '%#StatusLine#'
+		let g:tpipeline_statusline = s
+	endif
+
 	if g:tpipeline_clearstl
 		call tpipeline#lualine#clear_all_stl()
 	endif