entry completion: add checks that entry is set already

If any of the APIs that assumes that the entry is set already is used
before having one already set, things break pretty badly.

Fixes a downstream issue reported at https://github.com/gtk-rs/gtk4-rs/issues/873

diff --git a/gtk/gtkentrycompletion.c b/gtk/gtkentrycompletion.c
index 408047adf05c69a3ffb4c8bfddb5fb1c95721b29..ef4985af72caf56e11ba764e0d83f32735fad88f 100644 (file)
--- a/gtk/gtkentrycompletion.c
+++ b/gtk/gtkentrycompletion.c
@@ -1211,6 +1211,8 @@ gtk_entry_completion_match_selected (GtkEntryCompletion *completion,
                                      GtkTreeModel       *model,
                                      GtkTreeIter        *iter)
 {
+  g_assert (completion->entry != NULL);
+
   char *str = NULL;
 
   gtk_tree_model_get (model, iter, completion->text_column, &str, -1);
@@ -1229,6 +1231,8 @@ gtk_entry_completion_cursor_on_match (GtkEntryCompletion *completion,
                                       GtkTreeModel       *model,
                                       GtkTreeIter        *iter)
 {
+  g_assert (completion->entry != NULL);
+
   gtk_entry_completion_insert_completion (completion, model, iter);
 
   return TRUE;
@@ -1317,6 +1321,8 @@ static gboolean
 gtk_entry_completion_real_insert_prefix (GtkEntryCompletion *completion,
                                          const char         *prefix)
 {
+  g_assert (completion->entry != NULL);
+
   if (prefix)
     {
       int key_len;
@@ -1417,6 +1423,8 @@ gtk_entry_completion_insert_completion (GtkEntryCompletion *completion,
 void
 gtk_entry_completion_insert_prefix (GtkEntryCompletion *completion)
 {
+  g_return_if_fail (completion->entry != NULL);
+
   gboolean done;
   char *prefix;
   GtkText *text = gtk_entry_get_text_widget (GTK_ENTRY (completion->entry));