From 5c5244b1622561809173cbfc41fa9c1290d55fe2 Mon Sep 17 00:00:00 2001
From: Albrecht Schlosser <albrechts.fltk@online.de>
Date: Tue, 9 Nov 2021 19:36:26 +0100
Subject: Fix a fluid crash when writing a template screenshot

We need to show() the window before we call fl_read_image() if it
is not shown yet, otherwise fluid would crash.
---
 fluid/Fl_Window_Type.cxx | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/fluid/Fl_Window_Type.cxx b/fluid/Fl_Window_Type.cxx
index 8f0f39dc1..62ed479f8 100644
--- a/fluid/Fl_Window_Type.cxx
+++ b/fluid/Fl_Window_Type.cxx
@@ -425,8 +425,14 @@ void Fl_Window_Type::open() {
 uchar *Fl_Window_Type::read_image(int &ww, int &hh) {
   Overlay_Window *w = (Overlay_Window *)o;
 
+  int hidden = !w->shown();
+  w->show(); // make it the front window
+
   // Read the screen image...
-  return (w->read_image(ww, hh));
+  uchar *idata = w->read_image(ww, hh);
+  if (hidden)
+    w->hide();
+  return idata;
 }
 
 
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