[vte] pty: Add debug output for when EOS happens

[Christian Persch <chpe src gnome org>]

commit c33f440f867d210f03d8378a11c758a406234dd4
Author: Christian Persch <chpe src gnome org>
Date:   Tue Nov 26 19:24:00 2019 +0100

    pty: Add debug output for when EOS happens

 src/vte.cc | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/src/vte.cc b/src/vte.cc
index 78181688..1431c1e3 100644
--- a/src/vte.cc
+++ b/src/vte.cc
@@ -3900,6 +3900,7 @@ Terminal::pty_io_read(int const fd,
                       GIOCondition const condition)
 {
        _vte_debug_print (VTE_DEBUG_WORK, ".");
+        _vte_debug_print(VTE_DEBUG_IO, "::pty_io_read condition %02x\n", condition);
 
         /* We need to check for EOS so that we can shut down the PTY.
          * When we get G_IO_HUP without G_IO_IN, we can process the EOF now.
@@ -4048,6 +4049,8 @@ out:
        }
 
         if (eos) {
+               _vte_debug_print(VTE_DEBUG_IO, "got PTY EOF\n");
+
                 /* Make a note of the EOS; but do not process it since there may be data
                  * to be processed first in the incomding queue.
                  */