[gdb/tui] Refactor prefresh call in tui_source_window_base::refresh_window

Currently the call to prefresh in tui_source_window_base::refresh_window looks
like:
...
  prefresh (m_pad.get (), 0, pad_x, y + 1, x + left_margin,
	    y + m_content.size (), x + left_margin + view_width - 1);
...

This is hard to parse.  It's not obvious what the arguments mean, and there's
repetition in the argument calculation.

Fix this by rewriting the call as follows:
- use sminrow, smincol, smaxrow and smaxcol variables for the last
  4 arguments, and
- calculate the smaxrow and smaxcol variables based on the sminrow and
  smincol variables.

Tested on x86_64-linux.

Approved-By: Tom Tromey <tom@tromey.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/gdb/tui/tui-winsource.c b/gdb/tui/tui-winsource.c
index dd85765..7eabc52 100644
--- a/gdb/tui/tui-winsource.c
+++ b/gdb/tui/tui-winsource.c
@@ -347,8 +347,11 @@ tui_source_window_base::refresh_window ()
   gdb_assert (pad_width > 0 || m_pad.get () == nullptr);
   gdb_assert (pad_x + view_width <= pad_width || m_pad.get () == nullptr);
 
-  prefresh (m_pad.get (), 0, pad_x, y + 1, x + left_margin,
-	    y + m_content.size (), x + left_margin + view_width - 1);
+  int sminrow = y + 1;
+  int smincol = x + left_margin;
+  int smaxrow = sminrow + m_content.size () - 1;
+  int smaxcol = smincol + view_width - 1;
+  prefresh (m_pad.get (), 0, pad_x, sminrow, smincol, smaxrow, smaxcol);
 }
 
 void