[gnome-calculator] Fix function name crash f(x) if inputting new function name

[Robert Roth <robertroth src gnome org>]

commit 453d9a0bc61b94441adecf539006efc14541ec24
Author: Nathaniel Russell <naterussell83 gmail com>
Date:   Mon Aug 1 00:27:40 2022 +0000

    Fix function name crash  f(x) if inputting new function name

 fix.function-crash.patch | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
---
diff --git a/fix.function-crash.patch b/fix.function-crash.patch
new file mode 100644
index 00000000..20b3ff56
--- /dev/null
+++ b/fix.function-crash.patch
@@ -0,0 +1,46 @@
+diff -urN gnome-calculator-42.2/src/math-function-popover.vala 
gnome-calculator-42.2.new/src/math-function-popover.vala
+--- gnome-calculator-42.2/src/math-function-popover.vala       2022-07-01 15:15:12.000000000 -0500
++++ gnome-calculator-42.2.new/src/math-function-popover.vala   2022-07-31 17:57:09.047423677 -0500
+@@ -24,6 +24,8 @@
+     [GtkChild]
+     private unowned Gtk.Entry function_name_entry;
+     private bool function_name_entry_placeholder_reseted = false;
++    private ulong changed_handler;
++
+ 
+     [GtkChild]
+     private unowned Gtk.Button add_function_button;
+@@ -35,6 +37,7 @@
+         base (equation, model, (a,b) => MathFunction.name_compare_func (a as MathFunction,b as 
MathFunction));
+ 
+         function_list.bind_model (model, (item) => make_item_row(item as MathFunction));
++        changed_handler = function_name_entry.changed.connect (function_name_entry_changed_cb);
+ 
+         add_arguments_button.set_range (1, 10);
+         add_arguments_button.set_increments (1, 1);
+@@ -85,12 +88,13 @@
+     }
+     */
+ 
+-    [GtkCallback]
+     private void function_name_entry_changed_cb (Gtk.Editable editable)
+     {
+         this.function_name_entry_placeholder_reseted = true;
+         var entry = editable as Gtk.Entry;
++      SignalHandler.block (entry, changed_handler);
+         entry.text = entry.text.replace (" ", "_");
++        SignalHandler.unblock (entry, changed_handler);
+         add_function_button.sensitive = entry.text != "";
+     }
+ 
+diff -urN gnome-calculator-42.2/src/ui/math-function-popover.ui 
gnome-calculator-42.2.new/src/ui/math-function-popover.ui
+--- gnome-calculator-42.2/src/ui/math-function-popover.ui      2022-07-01 15:15:12.000000000 -0500
++++ gnome-calculator-42.2.new/src/ui/math-function-popover.ui  2022-07-31 17:55:03.768989873 -0500
+@@ -26,7 +26,6 @@
+           <object class="GtkEntry" id="function_name_entry">
+             <property name="placeholder_text" translatable="yes">New function</property>
+             <!--<signal name="focus" handler="function_name_focus_cb" swapped="no"/>-->
+-            <signal name="changed" handler="function_name_entry_changed_cb" swapped="no"/>
+             <signal name="activate" handler="add_function_cb" swapped="no"/>
+           </object>
+         </child>