From 82fa5ea19c004c05723919daa96e3c2779af2aad Mon Sep 17 00:00:00 2001
From: ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
Date: Mon, 15 Aug 2022 18:40:11 +0200
Subject: Fix Fl_Wayland_Window_Driver::decoration_sizes().

---
 src/drivers/Wayland/Fl_Wayland_Window_Driver.cxx | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

(limited to 'src')

diff --git a/src/drivers/Wayland/Fl_Wayland_Window_Driver.cxx b/src/drivers/Wayland/Fl_Wayland_Window_Driver.cxx
index 3c4cb76b6..6a74dae04 100644
--- a/src/drivers/Wayland/Fl_Wayland_Window_Driver.cxx
+++ b/src/drivers/Wayland/Fl_Wayland_Window_Driver.cxx
@@ -577,12 +577,14 @@ void Fl_Wayland_Window_Driver::iconize() {
 
 
 void Fl_Wayland_Window_Driver::decoration_sizes(int *top, int *left,  int *right, int *bottom) {
-  // Ensure border is on screen; these values are generic enough
-  // to work with many window managers, and are based on KDE defaults.
-  *top = 20;
-  *left = 4;
-  *right = 4;
-  *bottom = 8;
+  struct wld_window *xid = (struct wld_window*)fl_xid(pWindow);
+  if (xid && xid->kind == DECORATED) {
+    libdecor_frame_translate_coordinate(xid->frame, 0, 0, left, top);
+    *right = *left;
+    *bottom = 0;
+  } else {
+    Fl_Window_Driver::decoration_sizes(top, left, right, bottom);
+  }
 }
 
 void Fl_Wayland_Window_Driver::show_with_args_begin() {
-- 
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