A better fix for tab-line mouse highlight on TTY frames

* src/dispnew.c (mode_line_string):
* src/xdisp.c (note_mode_line_or_margin_highlight): Remove
recently-added workarounds for incorrect TTY mouse highlight:
they are no longer needed.
(mark_window_display_accurate_1): Set the header_line_p and
tab_line_p flags of the window's current_matrix if the window
displays these.
(display_mode_line): Set the header_line_p and tab_line_p
flags of the window's desired_matrix if the window displays
these.  (Bug#37807)

2 files changed, 10 insertions, 20 deletions

diff --git a/src/dispnew.c b/src/dispnew.c
index 47bf3c26cb2..4cdc76f5bcf 100644
--- a/src/dispnew.c
+++ b/src/dispnew.c
@@ -5517,15 +5517,7 @@ mode_line_string (struct window *w, enum window_part part,
   else if (part == ON_TAB_LINE)
     row = MATRIX_TAB_LINE_ROW (w->current_matrix);
   else
-    {
-      row = MATRIX_HEADER_LINE_ROW (w->current_matrix);
-      /* On TTY frames the matrix's tab_line_p flag is not set
-         (FIXME!), so we need to adjust by hand.  */
-      if (!FRAME_WINDOW_P (XFRAME (w->frame))
-          && window_wants_tab_line (w))
-
-        row++;
-    }
+    row = MATRIX_HEADER_LINE_ROW (w->current_matrix);
   y0 = *y - row->y;
   *y = row - MATRIX_FIRST_TEXT_ROW (w->current_matrix);
 
diff --git a/src/xdisp.c b/src/xdisp.c
index 0d8f9a1edd5..8cbda08efc5 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -15988,6 +15988,8 @@ mark_window_display_accurate_1 (struct window *w, bool accurate_p)
       w->current_matrix->buffer = b;
       w->current_matrix->begv = BUF_BEGV (b);
       w->current_matrix->zv = BUF_ZV (b);
+      w->current_matrix->header_line_p = window_wants_header_line (w);
+      w->current_matrix->tab_line_p = window_wants_tab_line (w);
 
       w->last_cursor_vpos = w->cursor.vpos;
       w->last_cursor_off_p = w->cursor_off_p;
@@ -24947,7 +24949,12 @@ display_mode_line (struct window *w, enum face_id face_id, Lisp_Object format)
 
   it.glyph_row->mode_line_p = true;
   if (face_id == TAB_LINE_FACE_ID)
-    it.glyph_row->tab_line_p = true;
+    {
+      it.glyph_row->tab_line_p = true;
+      w->desired_matrix->tab_line_p = true;
+    }
+  else if (face_id == HEADER_LINE_FACE_ID)
+    w->desired_matrix->header_line_p = true;
 
   /* FIXME: This should be controlled by a user option.  But
      supporting such an option is not trivial, since the mode line is
@@ -32488,11 +32495,6 @@ note_mode_line_or_margin_highlight (Lisp_Object window, int x, int y,
                 ? MATRIX_TAB_LINE_ROW (w->current_matrix)
                 : MATRIX_HEADER_LINE_ROW (w->current_matrix)));
 
-      /* On TTY frames the matrix's tab_line_p flag is not set
-         (FIXME!), so we need to adjust by hand.  */
-      if (!FRAME_WINDOW_P (f) && area == ON_HEADER_LINE
-          && window_wants_tab_line (w))
-        row++;
       /* Find the glyph under the mouse pointer.  */
       if (row->mode_line_p && row->enabled_p)
         {
@@ -32707,11 +32709,7 @@ note_mode_line_or_margin_highlight (Lisp_Object window, int x, int y,
                   ? (w->current_matrix)->nrows - 1
                   : (area == ON_TAB_LINE
                      ? 0
-                     : ((w->current_matrix->tab_line_p
-                         /* The window_wants_tab_line test is for TTY
-                            frames where the tab_line_p flag is not
-                            set (FIXME!).  */
-                         || window_wants_tab_line (w))
+                     : (w->current_matrix->tab_line_p
                         ? 1
                         : 0)));