vim-patch:9.0.0048: cursor in wrong column with mouse click after concealed text

Problem:    Cursor in wrong column with mouse click after concealed text.
Solution:   Store the text column when drawing text.

b90818867c

Tests only. Code changes moved to the port of patch 9.0.1725.

Co-authored-by: Bram Moolenaar <Bram@vim.org>

test/old/testdir/test_conceal.vim

@@ -4,6 +4,7 @@ source check.vim
 CheckFeature conceal
 
 source screendump.vim
+source view_util.vim
 
 func Test_conceal_two_windows()
   CheckScreendump
@@ -334,4 +335,23 @@ func Test_conceal_eol()
   set nolist
 endfunc
 
+func Test_conceal_mouse_click()
+  enew!
+  set mouse=a
+  setlocal conceallevel=2 concealcursor=nc
+  syn match Concealed "this" conceal
+  hi link Concealed Search
+  call setline(1, 'conceal this click here')
+  redraw
+  call assert_equal(['conceal  click here '], ScreenLines(1, 20))
+
+  " click on 'h' of "here" puts cursor there
+  call Ntest_setmouse(1, 16)
+  call feedkeys("\<LeftMouse>", "tx")
+  call assert_equal([0, 1, 20, 0, 20], getcurpos())
+
+  bwipe!
+  set mouse&
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab