patch 9.1.0174: 'cursorline' and 'wincolor' hl missing with conceal and wrap

Problem:  'cursorline' and 'wincolor' highlight missing with concealed and
          wrapped lines.
Solution: Apply 'cursorline' and 'wincolor' highlight to boguscols.
          (zeertzjq)

Since 'cursorline' and 'wincolor' highlight apply after the end of the
line, it is more consistent to have them also apply to boguscols.

Assigning MAXCOL to values in ScreenCols[] make mouse click behave the
same with 'cursorline' and 'nocursorline', but such behavior may be
incorrect, as it puts the cursor on the next screen line.  That may be
fixed in a future PR.

closes: #14192

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/drawline.c

@@ -4121,6 +4121,47 @@ win_line(
 	{
 #ifdef FEAT_CONCEAL
 	    wlv.col -= wlv.boguscols;
+	    // Apply 'cursorline' and 'wincolor' highlight.
+	    if (wlv.boguscols != 0 && (
+# ifdef LINE_ATTR
+			wlv.line_attr != 0 ||
+# endif
+			wlv.win_attr != 0
+			)
+	       )
+	    {
+		int attr = wlv.win_attr;
+# ifdef LINE_ATTR
+		if (wlv.line_attr != 0)
+		    attr = hl_combine_attr(attr, wlv.line_attr);
+# endif
+		while ((
+# ifdef FEAT_RIGHTLEFT
+			    wp->w_p_rl ? wlv.col >= 0 :
+# endif
+			    wlv.col < wp->w_width))
+		{
+		    ScreenLines[wlv.off] = ' ';
+		    if (enc_utf8)
+			ScreenLinesUC[wlv.off] = 0;
+		    ScreenAttrs[wlv.off] = attr;
+		    ScreenCols[wlv.off] = MAXCOL;  // TODO: this is wrong
+# ifdef FEAT_RIGHTLEFT
+		    if (wp->w_p_rl)
+		    {
+			wlv.off--;
+			wlv.col--;
+			wlv.boguscols++;
+		    }
+		    else
+# endif
+		    {
+			wlv.off++;
+			wlv.col++;
+			wlv.boguscols--;
+		    }
+		}
+	    }
 	    wlv_screen_line(wp, &wlv, FALSE);
 	    wlv.col += wlv.boguscols;
 	    wlv.boguscols = 0;

src/testdir/dumps/Test_conceal_cul_wcr_01.dump

@@ -0,0 +1,4 @@
+|o+8&#ffffff0|n|e| |o|n|e| |o|n|e| @1|o|n|e| |o|n|e| |o|n|e| |o|n|e| |o|n>e| @7
+@1|o|n|e| |o|n|e| |o|n|e| @27
+|~+0#4040ff13&| @38
+| +0#0000000&@21|1|,|4|0| @9|A|l@1| 

src/testdir/dumps/Test_conceal_cul_wcr_02.dump

@@ -0,0 +1,4 @@
+|o+8#ffffff16#e000002|n|e| |o|n|e| |o|n|e| @1|o|n|e| |o|n|e| |o|n|e| |o|n|e| |o|n>e| @7
+@1|o|n|e| |o|n|e| |o|n|e| @27
+|~+0#4040ff13&| @38
+|:+0#0000000#ffffff0|s|e|t| |w|i|n|c|o|l|o|r|=|E|r@1|o|r|M|s|g|1|,|4|0| @9|A|l@1| 

src/testdir/dumps/Test_conceal_cul_wcr_03.dump

@@ -0,0 +1,4 @@
+|o+0#ffffff16#e000002|n|e| |o|n|e| |o|n|e| @1|o|n|e| |o|n|e| |o|n|e| |o|n|e| |o|n>e| @7
+@1|o|n|e| |o|n|e| |o|n|e| @27
+|~+0#4040ff13&| @38
+|:+0#0000000#ffffff0|s|e|t| |n|o|c|u|r|s|o|r|l|i|n|e| @4|1|,|4|0| @9|A|l@1| 

src/testdir/dumps/Test_conceal_cul_wcr_rl_01.dump

@@ -0,0 +1,4 @@
+| +8&#ffffff0@7>e|n|o| |e|n|o| |e|n|o| |e|n|o| |e|n|o| @1|e|n|o| |e|n|o| |e|n|o
+| @27|e|n|o| |e|n|o| |e|n|o| 
+| +0#4040ff13&@38|~
+| +0#0000000&@21|1|,|4|0| @9|A|l@1| 

src/testdir/dumps/Test_conceal_cul_wcr_rl_02.dump

@@ -0,0 +1,4 @@
+| +8#ffffff16#e000002@7>e|n|o| |e|n|o| |e|n|o| |e|n|o| |e|n|o| @1|e|n|o| |e|n|o| |e|n|o
+| @27|e|n|o| |e|n|o| |e|n|o| 
+| +0#4040ff13&@38|~
+|:+0#0000000#ffffff0|s|e|t| |w|i|n|c|o|l|o|r|=|E|r@1|o|r|M|s|g|1|,|4|0| @9|A|l@1| 

src/testdir/dumps/Test_conceal_cul_wcr_rl_03.dump

@@ -0,0 +1,4 @@
+| +0#ffffff16#e000002@7>e|n|o| |e|n|o| |e|n|o| |e|n|o| |e|n|o| @1|e|n|o| |e|n|o| |e|n|o
+| @27|e|n|o| |e|n|o| |e|n|o| 
+| +0#4040ff13&@38|~
+|:+0#0000000#ffffff0|s|e|t| |n|o|c|u|r|s|o|r|l|i|n|e| @4|1|,|4|0| @9|A|l@1| 

src/testdir/test_conceal.vim

@@ -171,6 +171,57 @@ func Test_conceal_with_cursorcolumn()
   call StopVimInTerminal(buf)
 endfunc
 
+" Check that 'cursorline' and 'wincolor' apply to the whole line in presence
+" of wrapped lines containing concealed text.
+func Test_conceal_wrapped_cursorline_wincolor()
+  CheckScreendump
+
+  let code =<< trim [CODE]
+    call setline(1, 'one one one |hidden| one one one one one one one one')
+    syntax match test /|hidden|/ conceal
+    set conceallevel=2 concealcursor=n cursorline
+    normal! g$
+  [CODE]
+
+  call writefile(code, 'XTest_conceal_cul_wcr', 'D')
+  let buf = RunVimInTerminal('-S XTest_conceal_cul_wcr', {'rows': 4, 'cols': 40})
+  call VerifyScreenDump(buf, 'Test_conceal_cul_wcr_01', {})
+
+  call term_sendkeys(buf, ":set wincolor=ErrorMsg\n")
+  call VerifyScreenDump(buf, 'Test_conceal_cul_wcr_02', {})
+
+  call term_sendkeys(buf, ":set nocursorline\n")
+  call VerifyScreenDump(buf, 'Test_conceal_cul_wcr_03', {})
+
+  " clean up
+  call StopVimInTerminal(buf)
+endfunc
+
+" Same as Test_conceal_wrapped_cursorline_wincolor(), but with 'rightleft'.
+func Test_conceal_wrapped_cursorline_wincolor_rightleft()
+  CheckScreendump
+
+  let code =<< trim [CODE]
+    call setline(1, 'one one one |hidden| one one one one one one one one')
+    syntax match test /|hidden|/ conceal
+    set conceallevel=2 concealcursor=n cursorline rightleft
+    normal! g$
+  [CODE]
+
+  call writefile(code, 'XTest_conceal_cul_wcr_rl', 'D')
+  let buf = RunVimInTerminal('-S XTest_conceal_cul_wcr_rl', {'rows': 4, 'cols': 40})
+  call VerifyScreenDump(buf, 'Test_conceal_cul_wcr_rl_01', {})
+
+  call term_sendkeys(buf, ":set wincolor=ErrorMsg\n")
+  call VerifyScreenDump(buf, 'Test_conceal_cul_wcr_rl_02', {})
+
+  call term_sendkeys(buf, ":set nocursorline\n")
+  call VerifyScreenDump(buf, 'Test_conceal_cul_wcr_rl_03', {})
+
+  " clean up
+  call StopVimInTerminal(buf)
+endfunc
+
 func Test_conceal_resize_term()
   CheckScreendump
 

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    174,
 /**/
     173,
 /**/