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Auto merge of #2946 - micbou:docs-ctrl-r-remap, r=puremourning

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[READY] Add an entry in the docs about remapping CTRL-R in completion mode

The `<C-R>` key cannot be remapped in YCM's completion mode (`<C-X><C-U>`) due to a Vim limitation. Add an entry in the FAQ about this.

Closes https://github.com/Valloric/YouCompleteMe/issues/2943.

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8
README.md
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@ -3059,6 +3059,14 @@ will only list tag files that already exist.
YCM uses `completefunc` completion mode to show suggestions and Vim disables
`<C-U>` in that mode as a "feature." Sadly there's nothing I can do about this.
### My `CTRL-R` mapping does not work while the completion menu is visible
Vim prevents remapping of the `<C-R>` key in all `<C-X>` completion modes
(except the `<C-X><C-N>`/`<C-X><C-P>` mode which operates in the same mode as
`<C-N>`/`<C-P>`) and YCM uses the `<C-X><C-U>` (`completefunc`) mode for
completions. This means that adding `<C-R>` to any of the `g:ycm_key_list_*`
options has no effect. You need to use another key.
### YCM conflicts with UltiSnips TAB key usage
YCM comes with support for UltiSnips (snippet suggestions in the popup menu),

45
doc/youcompleteme.txt
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@ -162,26 +162,27 @@ Contents ~
16. 'install.py' says python must be compiled with '--enable-framework'. Wat? |youcompleteme-install.py-says-python-must-be-compiled-with-enable-framework-.-wat|
17. YCM does not read identifiers from my tags files |youcompleteme-ycm-does-not-read-identifiers-from-my-tags-files|
18. 'CTRL-U' in insert mode does not work while the completion menu is visible |youcompleteme-ctrl-u-in-insert-mode-does-not-work-while-completion-menu-is-visible|
19. YCM conflicts with UltiSnips TAB key usage |youcompleteme-ycm-conflicts-with-ultisnips-tab-key-usage|
20. Snippets added with ':UltiSnipsAddFiletypes' do not appear in the popup menu |youcompleteme-snippets-added-with-ultisnipsaddfiletypes-do-not-appear-in-popup-menu|
21. Why isn't YCM just written in plain VimScript, FFS? |youcompleteme-why-isnt-ycm-just-written-in-plain-vimscript-ffs|
22. Why does YCM demand such a recent version of Vim? |youcompleteme-why-does-ycm-demand-such-recent-version-of-vim|
23. Nasty bugs happen if I have the 'vim-autoclose' plugin installed |youcompleteme-nasty-bugs-happen-if-i-have-vim-autoclose-plugin-installed|
24. Is there some sort of YCM mailing list? I have questions |youcompleteme-is-there-sort-of-ycm-mailing-list-i-have-questions|
25. I get an internal compiler error when installing |youcompleteme-i-get-an-internal-compiler-error-when-installing|
26. I get weird errors when I press 'Ctrl-C' in Vim |youcompleteme-i-get-weird-errors-when-i-press-ctrl-c-in-vim|
27. Why did YCM stop using Syntastic for diagnostics display? |youcompleteme-why-did-ycm-stop-using-syntastic-for-diagnostics-display|
28. Completion doesn't work with the C++ standard library headers |youcompleteme-completion-doesnt-work-with-c-standard-library-headers|
29. When I open a JavaScript file, I get an annoying warning about '.tern-project'
19. My 'CTRL-R' mapping does not work while the completion menu is visible |youcompleteme-my-ctrl-r-mapping-does-not-work-while-completion-menu-is-visible|
20. YCM conflicts with UltiSnips TAB key usage |youcompleteme-ycm-conflicts-with-ultisnips-tab-key-usage|
21. Snippets added with ':UltiSnipsAddFiletypes' do not appear in the popup menu |youcompleteme-snippets-added-with-ultisnipsaddfiletypes-do-not-appear-in-popup-menu|
22. Why isn't YCM just written in plain VimScript, FFS? |youcompleteme-why-isnt-ycm-just-written-in-plain-vimscript-ffs|
23. Why does YCM demand such a recent version of Vim? |youcompleteme-why-does-ycm-demand-such-recent-version-of-vim|
24. Nasty bugs happen if I have the 'vim-autoclose' plugin installed |youcompleteme-nasty-bugs-happen-if-i-have-vim-autoclose-plugin-installed|
25. Is there some sort of YCM mailing list? I have questions |youcompleteme-is-there-sort-of-ycm-mailing-list-i-have-questions|
26. I get an internal compiler error when installing |youcompleteme-i-get-an-internal-compiler-error-when-installing|
27. I get weird errors when I press 'Ctrl-C' in Vim |youcompleteme-i-get-weird-errors-when-i-press-ctrl-c-in-vim|
28. Why did YCM stop using Syntastic for diagnostics display? |youcompleteme-why-did-ycm-stop-using-syntastic-for-diagnostics-display|
29. Completion doesn't work with the C++ standard library headers |youcompleteme-completion-doesnt-work-with-c-standard-library-headers|
30. When I open a JavaScript file, I get an annoying warning about '.tern-project'
file |youcompleteme-when-i-open-javascript-file-i-get-an-annoying-warning-about-.tern-project-file|
30. When I start vim I get a runtime error saying 'R6034 An application has made an
31. When I start vim I get a runtime error saying 'R6034 An application has made an
attempt to load the C runtime library incorrectly.' |youcompleteme-when-i-start-vim-i-get-runtime-error-saying-r6034-an-application-has-made-an-attempt-to-load-c-runtime-library-incorrectly.|
31. I hear that YCM only supports Python 2, is that true? |youcompleteme-i-hear-that-ycm-only-supports-python-2-is-that-true|
32. On Windows I get "E887: Sorry, this command is disabled, the Python's site
32. I hear that YCM only supports Python 2, is that true? |youcompleteme-i-hear-that-ycm-only-supports-python-2-is-that-true|
33. On Windows I get "E887: Sorry, this command is disabled, the Python's site
module could not be loaded" |youcompleteme-on-windows-i-get-e887-sorry-this-command-is-disabled-pythons-site-module-could-not-be-loaded|
33. I can't complete python packages in a virtual environment. |youcompleteme-i-cant-complete-python-packages-in-virtual-environment.|
34. I want to defer loading of YouCompleteMe until after Vim finishes booting |i-want-to-defer-loading-of-youcompleteme-until-after-vim-finishes-booting|
35. YCM does not shut down when I quit Vim |youcompleteme-ycm-does-not-shut-down-when-i-quit-vim|
34. I can't complete python packages in a virtual environment. |youcompleteme-i-cant-complete-python-packages-in-virtual-environment.|
35. I want to defer loading of YouCompleteMe until after Vim finishes booting |i-want-to-defer-loading-of-youcompleteme-until-after-vim-finishes-booting|
36. YCM does not shut down when I quit Vim |youcompleteme-ycm-does-not-shut-down-when-i-quit-vim|
14. Contributor Code of Conduct |youcompleteme-contributor-code-of-conduct|
15. Contact |youcompleteme-contact|
16. License |youcompleteme-license|
@ -3335,6 +3336,16 @@ function will only list tag files that already exist.
YCM uses 'completefunc' completion mode to show suggestions and Vim disables
'<C-U>' in that mode as a "feature." Sadly there's nothing I can do about this.
-------------------------------------------------------------------------------
*youcompleteme-my-ctrl-r-mapping-does-not-work-while-completion-menu-is-visible*
My 'CTRL-R' mapping does not work while the completion menu is visible ~
Vim prevents remapping of the '<C-R>' key in all '<C-X>' completion modes
(except the '<C-X><C-N>'/'<C-X><C-P>' mode which operates in the same mode as
'<C-N>'/'<C-P>') and YCM uses the '<C-X><C-U>' ('completefunc') mode for
completions. This means that adding '<C-R>' to any of the 'g:ycm_key_list_*'
options has no effect. You need to use another key.
-------------------------------------------------------------------------------
*youcompleteme-ycm-conflicts-with-ultisnips-tab-key-usage*
YCM conflicts with UltiSnips TAB key usage ~