[gthumb] properties pane disappears when changing position in viewer mode

[Paolo Bacchilega <paobac src gnome org>]

commit 490d797beb76da06341cab5048440b3b4d355a92
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Wed Jan 15 09:45:59 2020 +0100

    properties pane disappears when changing position in viewer mode
    
    Fixes https://gitlab.gnome.org/GNOME/gthumb/issues/79

 gthumb/gth-browser.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/gthumb/gth-browser.c b/gthumb/gth-browser.c
index f9399cec..876119e5 100644
--- a/gthumb/gth-browser.c
+++ b/gthumb/gth-browser.c
@@ -3867,6 +3867,9 @@ pref_browser_properties_on_the_right_changed (GSettings  *settings,
        if (old_parent == new_parent)
                return;
 
+       if (gth_window_get_current_page (GTH_WINDOW (browser)) != GTH_BROWSER_PAGE_BROWSER)
+               return;
+
        gtk_widget_unrealize (browser->priv->file_properties);
        _gtk_widget_reparent (browser->priv->file_properties, new_parent);
        /* restore the child properties that gtk_widget_reparent doesn't preserve. */