Re: [RFC 8.3 0/3] Some style fixes

[Eli Zaretskii <eliz@gnu.org>]

> Date: Tue, 12 Mar 2019 17:08:33 +0000 (UTC)
> From: "Hannes Domani via gdb-patches" <gdb-patches@sourceware.org>
> 
> In copy_source_line() it checks if (column < first_col), and because of the ++column directly
> before, it basically starts with 1 instead of 0.
> 
> Attached is a patch that fixes most of 2) and 3), but I ignored the handling of escaped
> characters, because I just don't have them in any of my sources.

I can confirm that this patch fixes the problems with horizontal
scrolling, with or without TAB characters in the sources.  I think we
should push it.

I also found another regression in the TUI configuration: if you step
with, say, "next" through the program, and execution winds up on a
line that is longer than the source window-width, then the current
line gets redrawn in reverse video, and as result it overwrites the
window-frame and a portion of the next source line.  This happens
because we only update one source line, and we do that in a way that
doesn't take the window width and horizontal scrolling offset into
account.

Here's the patch that fixes this regression:

--- gdb/tui/tui-winsource.c~5	2019-03-12 16:51:50.000000000 +0200
+++ gdb/tui/tui-winsource.c	2019-03-13 08:21:02.303443600 +0200
@@ -382,12 +387,30 @@ tui_set_is_exec_point_at (struct tui_lin
         {
           changed++;
           content[i]->which_element.source.is_exec_point = new_state;
-          tui_show_source_line (win_info, i + 1);
         }
       i++;
     }
   if (changed)
-    tui_refresh_win (&win_info->generic);
+    {
+      struct gdbarch *gdbarch = win_info->detail.source_info.gdbarch;
+      struct symtab *s = NULL;
+
+      if (win_info->generic.type == SRC_WIN)
+	{
+	  struct symtab_and_line cursal
+	    = get_current_source_symtab_and_line ();
+
+	  if (cursal.symtab == NULL)
+	    s = find_pc_line_symtab (get_frame_pc (get_selected_frame (NULL)));
+	  else
+	    s = cursal.symtab;
+	}
+      tui_update_source_window_as_is (win_info, gdbarch, s,
+				      win_info->generic.content[0]
+					->which_element.source.line_or_addr,
+				      FALSE);
+      tui_refresh_win (&win_info->generic);
+    }
 }
 
 /* Update the execution windows to show the active breakpoints.