Code completion doesn't respect allCommitCharacters

Here’s the documentation from lsp spec:

	/**
	 * The list of all possible characters that commit a completion. This field can be used
	 * if clients don't support individual commit characters per completion item. See
	 * `ClientCapabilities.textDocument.completion.completionItem.commitCharactersSupport`.
	 *
	 * If a server provides both `allCommitCharacters` and commit characters on an individual
	 * completion item the ones on the completion item win.
	 *
	 * @since 3.2.0
	 */
	allCommitCharacters?: string[];

clangd started sending this out in its completionProvider field recently, but it seems like CoC doesn’t fall back to allCommitCharacters when completionItem doesn’t have individual commit characters.

This results in only being able to commit a completion with hitting enter.

[fannheyward]

Correct me if I’m wrong. coc already added commitCharactersSupport, but not fallback to use allCommitCharacters?

[fannheyward]

Merged.