patch 8.0.1787: cannot insert the whole cursor line

Problem:    Cannot insert the whole cursor line.
Solution:   Make CTRL-R CTRL-L work. (Andy Massimino, closes #2857)

runtime/doc/cmdline.txt

@@ -175,12 +175,14 @@ CTRL-R CTRL-F				*c_CTRL-R_CTRL-F* *c_<C-R>_<C-F>*
 CTRL-R CTRL-P				*c_CTRL-R_CTRL-P* *c_<C-R>_<C-P>*
 CTRL-R CTRL-W				*c_CTRL-R_CTRL-W* *c_<C-R>_<C-W>*
 CTRL-R CTRL-A				*c_CTRL-R_CTRL-A* *c_<C-R>_<C-A>*
+CTRL-R CTRL-L				*c_CTRL-R_CTRL-L* *c_<C-R>_<C-L>*
 		Insert the object under the cursor:
 			CTRL-F	the Filename under the cursor
 			CTRL-P	the Filename under the cursor, expanded with
 				'path' as in |gf|
 			CTRL-W	the Word under the cursor
 			CTRL-A	the WORD under the cursor; see |WORD|
+			CTRL-L	the line under the cursor
 
 		When 'incsearch' is set the cursor position at the end of the
 		currently displayed match is used.  With CTRL-W the part of
@@ -192,8 +194,8 @@ CTRL-R CTRL-A				*c_CTRL-R_CTRL-A* *c_<C-R>_<C-A>*
 
 					*c_CTRL-R_CTRL-R* *c_<C-R>_<C-R>*
 					*c_CTRL-R_CTRL-O* *c_<C-R>_<C-O>*
-CTRL-R CTRL-R {0-9a-z"%#:-=. CTRL-F CTRL-P CTRL-W CTRL-A}
+CTRL-R CTRL-R {0-9a-z"%#:-=. CTRL-F CTRL-P CTRL-W CTRL-A CTRL-L}
-CTRL-R CTRL-O {0-9a-z"%#:-=. CTRL-F CTRL-P CTRL-W CTRL-A}
+CTRL-R CTRL-O {0-9a-z"%#:-=. CTRL-F CTRL-P CTRL-W CTRL-A CTRL-L}
 		Insert register or object under the cursor.  Works like
 		|c_CTRL-R| but inserts the text literally.  For example, if
 		register a contains "xy^Hz" (where ^H is a backspace),

src/ex_getln.c

@@ -3299,7 +3299,8 @@ cmdline_paste(
     /* check for valid regname; also accept special characters for CTRL-R in
      * the command line */
     if (regname != Ctrl_F && regname != Ctrl_P && regname != Ctrl_W
-	    && regname != Ctrl_A && !valid_yank_reg(regname, FALSE))
+	    && regname != Ctrl_A && regname != Ctrl_L
+	    && !valid_yank_reg(regname, FALSE))
 	return FAIL;
 
     /* A register containing CTRL-R can cause an endless loop.  Allow using

src/ops.c

@@ -1573,6 +1573,14 @@ get_spec_reg(
 	    *allocated = TRUE;
 	    return TRUE;
 
+	case Ctrl_L:		/* Line under cursor */
+	    if (!errmsg)
+		return FALSE;
+
+	    *argp = ml_get_buf(curwin->w_buffer,
+			curwin->w_cursor.lnum, FALSE);
+	    return TRUE;
+
 	case '_':		/* black hole: always empty */
 	    *argp = (char_u *)"";
 	    return TRUE;

src/testdir/test_cmdline.vim

@@ -306,6 +306,9 @@ func Test_paste_in_cmdline()
   call feedkeys("ft:aaa \<C-R>\<C-F> bbb\<C-B>\"\<CR>", 'tx')
   call assert_equal('"aaa /tmp/some bbb', @:)
 
+  call feedkeys(":aaa \<C-R>\<C-L> bbb\<C-B>\"\<CR>", 'tx')
+  call assert_equal('"aaa '.getline(1).' bbb', @:)
+
   set incsearch
   call feedkeys("fy:aaa veryl\<C-R>\<C-W> bbb\<C-B>\"\<CR>", 'tx')
   call assert_equal('"aaa verylongword bbb', @:)

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1787,
 /**/
     1786,
 /**/