[gimp/gimp-2-10] Issue #4107: Removing titlebar/borders from Windows Splash Screen (Backport)

[Jehan <jehanp src gnome org>]

commit 8229194abf82eb1d3b1123f378b72343041fe9e9
Author: Nikc <nikcdc gmail com>
Date:   Mon Jan 31 19:56:56 2022 +0000

    Issue #4107: Removing titlebar/borders from Windows Splash Screen (Backport)

 app/gui/splash.c | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/app/gui/splash.c b/app/gui/splash.c
index e25c1b0bc6..f257e7b5d0 100644
--- a/app/gui/splash.c
+++ b/app/gui/splash.c
@@ -142,6 +142,12 @@ splash_create (gboolean   be_verbose,
                   "resizable",       FALSE,
                   NULL);
 
+  /* Don't remove this call, it's necessary to remove decorations on Windows
+   * (which is the natural state of splash-screens). Looks like the
+   * GDK_WINDOW_TYPE_HINT_SPLASHSCREEN hint is not used on some platforms.
+   */
+  gtk_window_set_decorated (GTK_WINDOW (splash->window), FALSE);
+
   g_signal_connect_swapped (splash->window, "delete-event",
                             G_CALLBACK (exit),
                             GINT_TO_POINTER (0));