merge: doc about lazy loading

refer: #2560

README.md

@@ -61,6 +61,13 @@ Or use some other plugin manager:
 * [neobundle](https://github.com/Shougo/neobundle.vim)
 * [pathogen](https://github.com/tpope/vim-pathogen)
 
+**Note**: Many plugin managers provide mechanisms to lazy load plugins. Please
+    don't use this for VimTeX! VimTeX is already lazy loaded by virtue of being
+    a filetype plugin and by using the autoload mechanisms. There is therefore
+    nothing to gain by forcing VimTeX to lazily load through the plugin
+    manager. In fact, doing it will _break_ the inverse-search mechanism, which
+    relies on a _global_ command (`:VimtexInverseSearch`).
+
 If you use the new package feature in Vim, please note the following:
 * Make sure to read and understand the package feature: `:help package`!
 * Use the `/pack/foo/start` subdirectory to make sure the filetype plugin is

doc/vimtex.txt

@@ -5503,6 +5503,10 @@ This may be avoided, or at least reduced, with the following variants: >
 Note: Vim users should be aware that one may need to ensure that the server is
       really running, see |vimtex-clientserver|.
 
+Note: Many plugin managers provide mechanisms to lazy load plugins. There is
+      no need to use such a mechanism for VimTeX, and in fact, doing it will
+      prevent Vim/neovim from loading the `:VimtexInverseSearch` command.
+
 ==============================================================================
 LATEX DOCUMENTATION                                           *vimtex-latexdoc*