Remove tui_win_info::refresh_all

The TUI has two duplicate "re-render this window" methods, "rerender"
and "refresh_all".  They differ only slightly in semantics, so I
wanted to see if they could be unified.

After looking into this, I decided that refresh_all was not needed.
There are 4 calls to tui_refresh_all_win (the only caller of this
method):

1. tui_enable.  This sets the layout, which renders the windows.

2. tui_cont_sig.  Here, I think it's sufficient to simply redraw the
   current window contents from the curses backing store, because gdb
   state didn't change while it was suspended

3. tui_dispatch_ctrl_char.  This is the C-l handler, and here it's
   explicitly enough to just refresh the screen (as above).

4. tui_refresh_all_command.  This is the command equivalent of C-l.

So, this patch removes this method entirely and simplifies
tui_refresh_all_win.

gdb/ChangeLog
2019-08-30  Tom Tromey  <tom@tromey.com>

	* tui/tui-winsource.h (struct tui_source_window_base)
	<refresh_all>: Don't declare.
	* tui/tui-winsource.c (tui_source_window_base::refresh_all):
	Remove.
	* tui/tui-win.c (tui_refresh_all_win): Don't call refresh_all or
	tui_show_locator_content.
	* tui/tui-regs.h (struct tui_data_window) <refresh_all>: Don't
	declare.
	* tui/tui-regs.c (tui_data_window::refresh_all): Remove.
	* tui/tui-data.h (struct tui_win_info) <refresh_all>: Don't
	declare.

gdb/ChangeLog

@@ -1,3 +1,17 @@
+2019-08-30  Tom Tromey  <tom@tromey.com>
+
+	* tui/tui-winsource.h (struct tui_source_window_base)
+	<refresh_all>: Don't declare.
+	* tui/tui-winsource.c (tui_source_window_base::refresh_all):
+	Remove.
+	* tui/tui-win.c (tui_refresh_all_win): Don't call refresh_all or
+	tui_show_locator_content.
+	* tui/tui-regs.h (struct tui_data_window) <refresh_all>: Don't
+	declare.
+	* tui/tui-regs.c (tui_data_window::refresh_all): Remove.
+	* tui/tui-data.h (struct tui_win_info) <refresh_all>: Don't
+	declare.
+
 2019-08-30  Tom Tromey  <tom@tromey.com>
 
 	* tui/tui-io.c (tui_cont_sig): Don't call wrefresh.

gdb/tui/tui-data.h

@@ -162,12 +162,6 @@ public:
   {
   }
 
-  /* Called after all the TUI windows are refreshed, to let this
-     window have a chance to update itself further.  */
-  virtual void refresh_all ()
-  {
-  }
-
   /* Compute the maximum height of this window.  */
   virtual int max_height () const;
 

gdb/tui/tui-regs.c

@@ -403,29 +403,6 @@ tui_data_window::rerender ()
 }
 
 
-/* Function to redisplay the contents of the data window.  */
-void
-tui_data_window::refresh_all ()
-{
-  erase_data_content (NULL);
-  if (!regs_content.empty ())
-    {
-      int first_element = first_data_item_displayed ();
-
-      if (first_element >= 0)	/* Re-use existing windows.  */
-	{
-	  int first_line = (-1);
-
-	  if (first_element < regs_content.size ())
-	    first_line = line_from_reg_element_no (first_element);
-
-	  if (first_line >= 0)
-	    display_registers_from_line (first_line);
-	}
-    }
-}
-
-
 /* Scroll the data window vertically forward or backward.  */
 void
 tui_data_window::do_scroll_vertical (int num_to_scroll)

gdb/tui/tui-regs.h

@@ -58,8 +58,6 @@ struct tui_data_window : public tui_win_info
 
   DISABLE_COPY_AND_ASSIGN (tui_data_window);
 
-  void refresh_all () override;
-
   void refresh_window () override;
 
   const char *name () const override

gdb/tui/tui-win.c

@@ -504,12 +504,6 @@ tui_refresh_all_win (void)
 {
   clearok (curscr, TRUE);
   tui_refresh_all ();
-  for (tui_win_info *win_info : all_tui_windows ())
-    {
-      if (win_info->is_visible ())
-	win_info->refresh_all ();
-    }
-  tui_show_locator_content ();
 }
 
 void

gdb/tui/tui-winsource.c

@@ -280,16 +280,6 @@ tui_source_window_base::~tui_source_window_base ()
 
 /* See tui-data.h.  */
 
-void
-tui_source_window_base::refresh_all ()
-{
-  show_source_content ();
-  check_and_display_highlight_if_needed ();
-  update_exec_info ();
-}
-
-/* See tui-data.h.  */
-
 void
 tui_source_window_base::update_tab_width ()
 {

gdb/tui/tui-winsource.h

@@ -103,8 +103,6 @@ public:
 
   void clear_detail ();
 
-  void refresh_all () override;
-
   /* Refill the source window's source cache and update it.  If this
      is a disassembly window, then just update it.  */
   void refill ();