[file-roller] file-selector-dialog: enable add button on select all

[Jeremy Bicha <jbicha src gnome org>]

commit ad6e910c15ba216aa000f62a2d57c7c6abc12deb
Author: Eric <eric daigle zaclys net>
Date:   Mon Jun 21 17:48:34 2021 -0400

    file-selector-dialog: enable add button on select all
    
    As described in #129, selecting all files via the file selector context menu
    currently does not enable the Add button.
    
    This commit adds a call to _update_sensitivity in select_all_files, causing
    the Add button to behave as expected when all files are selected or deselected.
    
    Closes #129

 src/fr-file-selector-dialog.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/fr-file-selector-dialog.c b/src/fr-file-selector-dialog.c
index 5c4e036a..1ae2cc48 100644
--- a/src/fr-file-selector-dialog.c
+++ b/src/fr-file-selector-dialog.c
@@ -600,6 +600,8 @@ select_all_files (FrFileSelectorDialog *self,
                                    -1);
        }
        while (gtk_tree_model_iter_next (GTK_TREE_MODEL (list_store), &iter));
+
+       _update_sensitivity (self);
 }