mate-panel: apply selected fixes from v1.26.3

prevents mate-panel memory leaks and crashes.

helpers/DATA/mate-panel/01_7eed6c94204de780e7248fa711da03f72f900080.patch

+From 7eed6c94204de780e7248fa711da03f72f900080 Mon Sep 17 00:00:00 2001
+From: rbuj <robert.buj@gmail.com>
+Date: Wed, 26 Jan 2022 15:09:45 +0100
+Subject: [PATCH] wncklet: do not exceed workspace number when setting n_rows
+
+---
+ applets/wncklet/workspace-switcher.c | 11 +++++++----
+ 1 file changed, 7 insertions(+), 4 deletions(-)
+
+diff --git a/applets/wncklet/workspace-switcher.c b/applets/wncklet/workspace-switcher.c
+index a58abce21..f908ffe1c 100644
+--- a/applets/wncklet/workspace-switcher.c
++++ b/applets/wncklet/workspace-switcher.c
+@@ -490,11 +490,12 @@ static const GtkActionEntry pager_menu_actions[] = {
+ 
+ static void num_rows_changed(GSettings* settings, gchar* key, PagerData* pager)
+ {
+-	int n_rows = DEFAULT_ROWS;
++	int n_rows;
+ 
+-	n_rows = g_settings_get_int (settings, key);
+-
+-	n_rows = CLAMP(n_rows, 1, MAX_REASONABLE_ROWS);
++	n_rows = CLAMP (g_settings_get_int (settings, key),
++	                1,
++	                MIN (wnck_screen_get_workspace_count (pager->screen),
++	                     MAX_REASONABLE_ROWS));
+ 
+ 	pager->n_rows = n_rows;
+ 	pager_update(pager);
+@@ -823,6 +824,8 @@ on_num_workspaces_value_changed (GtkSpinButton *button,
+ 	{
+ 		int workspace_count = gtk_spin_button_get_value_as_int (button);
+ 		wnck_screen_change_workspace_count(pager->screen, workspace_count);
++		if (workspace_count < pager->n_rows)
++			g_settings_set_int (pager->settings, "num-rows", workspace_count);
+ 	}
+ #endif /* HAVE_X11 */
+ }