patch 9.0.0739: mouse column not correctly used for popup_setpos

Problem:    Mouse column not correctly used for popup_setpos.
Solution:   Adjust off-by-one error and handle Visual line selection properly.
            (Yee Cheng Chin, closes #11356)
diff --git a/src/testdir/test_termcodes.vim b/src/testdir/test_termcodes.vim
index cb1d01a..12c5737 100644
--- a/src/testdir/test_termcodes.vim
+++ b/src/testdir/test_termcodes.vim
@@ -1298,20 +1298,20 @@
     call assert_equal([1, 10], [line('.'), col('.')], msg)
     call assert_equal('ran away', @", msg)
 
-    " Test for right click in visual mode before the selection
+    " Test for right click in visual mode right before the selection
     let @" = ''
     call cursor(1, 10)
-    call feedkeys('vee' .. MouseRightClickCode(1, 2)
-		\ .. MouseRightReleaseCode(1, 2) .. "\<Down>\<CR>", "x")
-    call assert_equal([1, 2], [line('.'), col('.')], msg)
+    call feedkeys('vee' .. MouseRightClickCode(1, 9)
+		\ .. MouseRightReleaseCode(1, 9) .. "\<Down>\<CR>", "x")
+    call assert_equal([1, 9], [line('.'), col('.')], msg)
     call assert_equal('', @", msg)
 
-    " Test for right click in visual mode after the selection
+    " Test for right click in visual mode right after the selection
     let @" = ''
     call cursor(1, 10)
-    call feedkeys('vee' .. MouseRightClickCode(1, 20)
-		\ .. MouseRightReleaseCode(1, 20) .. "\<Down>\<CR>", "x")
-    call assert_equal([1, 20], [line('.'), col('.')], msg)
+    call feedkeys('vee' .. MouseRightClickCode(1, 18)
+		\ .. MouseRightReleaseCode(1, 18) .. "\<Down>\<CR>", "x")
+    call assert_equal([1, 18], [line('.'), col('.')], msg)
     call assert_equal('', @", msg)
 
     " Test for right click in block-wise visual mode inside the selection
@@ -1331,6 +1331,32 @@
     call assert_equal('v', getregtype('"'), msg)
     call assert_equal('', @", msg)
 
+    " Test for right click in line-wise visual mode inside the selection
+    let @" = ''
+    call cursor(1, 16)
+    call feedkeys("V" .. MouseRightClickCode(1, 10)
+		\ .. MouseRightReleaseCode(1, 10) .. "\<Down>\<CR>", "x")
+    call assert_equal([1, 1], [line('.'), col('.')], msg) " After yanking, the cursor goes to 1,1
+    call assert_equal("V", getregtype('"'), msg)
+    call assert_equal(len(getreg('"', 1, v:true)), 1, msg)
+
+    " Test for right click in multi-line line-wise visual mode inside the selection
+    let @" = ''
+    call cursor(1, 16)
+    call feedkeys("Vj" .. MouseRightClickCode(2, 20)
+		\ .. MouseRightReleaseCode(2, 20) .. "\<Down>\<CR>", "x")
+    call assert_equal([1, 1], [line('.'), col('.')], msg) " After yanking, the cursor goes to 1,1
+    call assert_equal("V", getregtype('"'), msg)
+    call assert_equal(len(getreg('"', 1, v:true)), 2, msg)
+
+    " Test for right click in line-wise visual mode outside the selection
+    let @" = ''
+    call cursor(1, 16)
+    call feedkeys("V" .. MouseRightClickCode(2, 10)
+		\ .. MouseRightReleaseCode(2, 10) .. "\<Down>\<CR>", "x")
+    call assert_equal([2, 10], [line('.'), col('.')], msg)
+    call assert_equal("", @", msg)
+
     " Try clicking on the status line
     let @" = ''
     call cursor(1, 10)