[gnome-calculator] Fixed variable autocompletion

[Robert Roth <robertroth src gnome org>]

commit 660c903bec807b33771400e68ed84f4e61bc47c6
Author: Robert Roth <robert roth off gmail com>
Date:   Tue Nov 30 02:17:46 2021 +0200

    Fixed variable autocompletion

 lib/math-variables.vala | 2 +-
 src/math-display.vala   | 5 ++++-
 2 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/lib/math-variables.vala b/lib/math-variables.vala
index 9685b2c4..4562561d 100644
--- a/lib/math-variables.vala
+++ b/lib/math-variables.vala
@@ -125,7 +125,7 @@ public class MathVariables : Object
     public string[] variables_eligible_for_autocompletion (string text)
     {
         string[] eligible_variables = {};
-        if (text.length <=1)
+        if (text.length < 1)
             return eligible_variables;
 
         string[] variables = get_names ();
diff --git a/src/math-display.vala b/src/math-display.vala
index 342c1836..82a65464 100644
--- a/src/math-display.vala
+++ b/src/math-display.vala
@@ -652,6 +652,8 @@ public class VariableCompletionProvider : CompletionProvider, GtkSource.Completi
         return _("Defined Variables");
     }
 
+    public override int get_priority (GtkSource.CompletionContext context) { return 1; }
+
     public static string[] get_matches_for_completion_at_cursor (GtkSource.CompletionContext context, 
MathVariables variables)
     {
         Gtk.TextIter start_iter, end_iter;
@@ -668,6 +670,7 @@ public class VariableCompletionProvider : CompletionProvider, GtkSource.Completi
     {
         ListStore proposals = new ListStore (typeof (CompletionProposal));
         string[] variables = get_matches_for_completion_at_cursor (context, _equation.variables);
+        string word = context.get_word ();
 
         if (variables.length > 0)
         {
@@ -681,6 +684,6 @@ public class VariableCompletionProvider : CompletionProvider, GtkSource.Completi
             }
         }
 
-        return proposals;
+        return new Gtk.FilterListModel (proposals, create_filter (word));
     }
 }