[gnumeric] GUI: Fix critical when dragging pane divider too far.

[Morten Welinder <mortenw src gnome org>]

commit c83f63717f8b2ee93a433fca780a9403d381e05b
Author: Morten Welinder <terra gnome org>
Date:   Wed May 28 09:47:24 2014 -0400

    GUI: Fix critical when dragging pane divider too far.

 ChangeLog               |    5 +++++
 src/sheet-control-gui.c |    2 ++
 src/sheet-view.c        |    8 ++++++++
 3 files changed, 15 insertions(+), 0 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index ec4b1fc..f6307fc 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2014-05-28  Morten Welinder  <terra gnome org>
 
+       * src/sheet-control-gui.c (resize_pane_pos): Improve the situation
+       when we drag the handle into the col/row canvas.
+
+       * src/sheet-view.c (sv_freeze_panes): Add debug code.
+
        * src/sheet-control-gui.c (scg_finalize): Get rid of the drag
        handler.  Fixes #730884.
 
diff --git a/src/sheet-control-gui.c b/src/sheet-control-gui.c
index 0411e48..e9cf8f9 100644
--- a/src/sheet-control-gui.c
+++ b/src/sheet-control-gui.c
@@ -1272,6 +1272,7 @@ resize_pane_pos (SheetControlGUI *scg, GtkPaned *p,
                        else
                                pos -= pa.width;
                }
+               pos = MAX (pos, 0);
                pos += pane->first_offset.x;
                colrow = gnm_pane_find_col (pane, pos, guide_pos);
        } else {
@@ -1289,6 +1290,7 @@ resize_pane_pos (SheetControlGUI *scg, GtkPaned *p,
                        else
                                pos -= pa.height;
                }
+               pos = MAX (pos, 0);
                pos += pane->first_offset.y;
                colrow = gnm_pane_find_row (pane, pos, guide_pos);
        }
diff --git a/src/sheet-view.c b/src/sheet-view.c
index c9e3508..18dc780 100644
--- a/src/sheet-view.c
+++ b/src/sheet-view.c
@@ -45,6 +45,7 @@
 #include "gnumeric-conf.h"
 #include "sheet-style.h"
 #include "mstyle.h"
+#include "gutils.h"
 
 #include <gsf/gsf-impl-utils.h>
 
@@ -786,6 +787,13 @@ sv_freeze_panes (SheetView *sv,
 {
        g_return_if_fail (IS_SHEET_VIEW (sv));
 
+       if (gnm_debug_flag ("frozen-panes")) {
+               g_printerr ("Frozen: %-10s",
+                           frozen ? cellpos_as_string (frozen) : "-");
+               g_printerr ("Unfrozen: %s\n",
+                           unfrozen ? cellpos_as_string (unfrozen) : "-");
+       }
+
        if (frozen != NULL) {
                g_return_if_fail (unfrozen != NULL);
                g_return_if_fail (unfrozen->col >= frozen->col);