[libhandy] keypad: Allow pasting and erasing text in the entry

[Adrien Plazas <aplazas src gnome org>]

commit 4244b080a836d24f5ce1b670faed6b92312ca09f
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Sun Dec 27 18:49:43 2020 +0500

    keypad: Allow pasting and erasing text in the entry
    
    Stop assuming that input is going to be 1 char only, instead allow it if
    all characters are valid. Take care to handle unicode correctly.
    
    Fixes https://gitlab.gnome.org/GNOME/libhandy/-/issues/394

 src/hdy-keypad.c | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)
---
diff --git a/src/hdy-keypad.c b/src/hdy-keypad.c
index 17a8e3f8..90f896ee 100644
--- a/src/hdy-keypad.c
+++ b/src/hdy-keypad.c
@@ -108,16 +108,25 @@ insert_text_cb (HdyKeypad   *self,
                 GtkEditable *editable)
 {
   HdyKeypadPrivate *priv = hdy_keypad_get_instance_private (self);
+  gchar *p = text;
 
-  g_assert (length == 1);
+  g_assert (g_utf8_validate (text, length, NULL));
 
-  if (g_ascii_isdigit (*text))
-     return;
+  while (p != text + length) {
+    gchar *q = p;
 
-  if (priv->symbols_visible && strchr ("#*+", *text))
-     return;
+    p = g_utf8_next_char (p);
 
-  g_signal_stop_emission_by_name (editable, "insert-text");
+    if (g_ascii_isdigit (*q))
+      continue;
+
+    if (priv->symbols_visible && strchr ("#*+", *q))
+      continue;
+
+    g_signal_stop_emission_by_name (editable, "insert-text");
+
+    return;
+  }
 }