Command line completion support for cexpr commands

[Yegappan Lakshmanan]

Hi,

The cexpr/cgetexpr/caddexpr commands take an expression as
an argument. The attached patch adds command line completion
support for these commands.

- Yegappan

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diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index 2b0f15e..898b23a 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -4094,6 +4094,12 @@ set_one_cmd_context(
        case CMD_echoerr:
        case CMD_call:
        case CMD_return:
+       case CMD_cexpr:
+       case CMD_caddexpr:
+       case CMD_cgetexpr:
+       case CMD_lexpr:
+       case CMD_laddexpr:
+       case CMD_lgetexpr:
            set_context_for_expression(xp, arg, ea.cmdidx);
            break;