highlight: Added QuickFixLine highlight group

- Links to Search by default

screen.c: Combine CursorLine with QuickFixLine

- HLF_QFL takes priority over HLF_CUL

docs: Updated to mention QuickFixLine
runtime: Added QuickFixLine to nvimHLGroup
tests: QuickFixLine highlight

src/nvim/globals.h

@@ -486,6 +486,7 @@ typedef enum {
   , HLF_CUC         /* 'cursurcolumn' */
   , HLF_CUL         /* 'cursurline' */
   , HLF_MC          /* 'colorcolumn' */
+  , HLF_QFL         // selected quickfix line
   , HLF_COUNT       /* MUST be the last one */
 } hlf_T;
 
@@ -494,7 +495,7 @@ typedef enum {
 #define HL_FLAGS {'8', '~', 'z', 'Z', '@', 'd', 'e', 'i', 'l', 'm', 'M', 'n', \
                   'N', 'r', 's', 'S', 'c', 't', 'v', 'V', 'w', 'W', 'f', 'F', \
                   'A', 'C', 'D', 'T', '-', '>', 'B', 'P', 'R', 'L', '+', '=', \
-                  'x', 'X', '*', '#', '_', '!', '.', 'o'}
+                  'x', 'X', '*', '#', '_', '!', '.', 'o', 'q'}
 
 EXTERN int highlight_attr[HLF_COUNT];       /* Highl. attr for each context. */
 EXTERN int highlight_user[9];                   /* User[1-9] attributes */

src/nvim/option.c

@@ -246,7 +246,7 @@ typedef struct vimoption {
   "A:DiffAdd,C:DiffChange,D:DiffDelete,T:DiffText,>:SignColumn,-:Conceal," \
   "B:SpellBad,P:SpellCap,R:SpellRare,L:SpellLocal,+:Pmenu,=:PmenuSel," \
   "x:PmenuSbar,X:PmenuThumb,*:TabLine,#:TabLineSel,_:TabLineFill," \
-  "!:CursorColumn,.:CursorLine,o:ColorColumn"
+  "!:CursorColumn,.:CursorLine,o:ColorColumn,q:QuickFixLine"
 
 /*
  * options[] is initialized here.

src/nvim/quickfix.c

@@ -1764,7 +1764,7 @@ void qf_list(exarg_T *eap)
         vim_snprintf((char *)IObuff, IOSIZE, "%2d %s",
             i, (char *)fname);
       msg_outtrans_attr(IObuff, i == qi->qf_lists[qi->qf_curlist].qf_index
-          ? hl_attr(HLF_L) : hl_attr(HLF_D));
+          ? hl_attr(HLF_QFL) : hl_attr(HLF_D));
       if (qfp->qf_lnum == 0)
         IObuff[0] = NUL;
       else if (qfp->qf_col == 0)

src/nvim/screen.c

@@ -2405,7 +2405,7 @@ win_line (
 
   /* Highlight the current line in the quickfix window. */
   if (bt_quickfix(wp->w_buffer) && qf_current_entry(wp) == lnum)
-    line_attr = hl_attr(HLF_L);
+    line_attr = hl_attr(HLF_QFL);
   if (line_attr != 0)
     area_highlighting = TRUE;
 
@@ -2624,7 +2624,12 @@ win_line (
    * then. */
   if (wp->w_p_cul && lnum == wp->w_cursor.lnum
       && !(wp == curwin && VIsual_active)) {
-    line_attr = hl_attr(HLF_CUL);
+    if (line_attr != 0 && !(State & INSERT) && bt_quickfix(wp->w_buffer)
+        && qf_current_entry(wp) == lnum) {
+      line_attr = hl_combine_attr(hl_attr(HLF_CUL), line_attr);
+    } else {
+      line_attr = hl_attr(HLF_CUL);
+    }
     area_highlighting = true;
   }
 

src/nvim/syntax.c

@@ -5902,6 +5902,7 @@ static char *highlight_init_both[] =
   "VertSplit    cterm=reverse gui=reverse",
   "WildMenu     ctermbg=Yellow ctermfg=Black guibg=Yellow guifg=Black",
   "default link EndOfBuffer NonText",
+  "default link QuickFixLine Search",
   NULL
 };