From 9f9e584919aefbd1f9911c22e6d72308d81785a2 Mon Sep 17 00:00:00 2001
From: ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
Date: Fri, 24 Mar 2023 16:56:25 +0100
Subject: [PATCH] Wayland Fl_Copy_Surface and Fl::copy() issues (#707) - cont'd

---
 README.Wayland.txt                               | 6 ++++++
 src/drivers/Wayland/fl_wayland_clipboard_dnd.cxx | 6 ++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/README.Wayland.txt b/README.Wayland.txt
index 98efcd5cd..c755a656a 100644
--- a/README.Wayland.txt
+++ b/README.Wayland.txt
@@ -96,6 +96,12 @@ a minimized window has no effect.
 it's currently not possible for an app to be notified of changes to the content of
 the system clipboard, that is, Fl::add_clipboard_notify() has no effect.
 
+* Copying data to the clipboard is best done when the app has focus. Any copy operation
+performed when the app not yet got the focus does not change the clipboard. A copy operation
+performed when the app has lost the focus is successful only if the type of the copied
+data, that is text or image, is the same as the last data type copied when the app had
+the focus.
+
 * Narrow windows with a titlebar are silently forced to be wide enough
 for the titlebar to display window buttons and a few letters of the title.
 
diff --git a/src/drivers/Wayland/fl_wayland_clipboard_dnd.cxx b/src/drivers/Wayland/fl_wayland_clipboard_dnd.cxx
index 2c78d399c..535d481fc 100644
--- a/src/drivers/Wayland/fl_wayland_clipboard_dnd.cxx
+++ b/src/drivers/Wayland/fl_wayland_clipboard_dnd.cxx
@@ -77,13 +77,15 @@ void write_data_source_cb(FL_SOCKET fd, data_source_write_struct *data) {
 static void data_source_handle_send(void *data, struct wl_data_source *source, const char *mime_type, int fd) {
   fl_intptr_t rank = (fl_intptr_t)data;
 //fprintf(stderr, "data_source_handle_send: %s fd=%d l=%d\n", mime_type, fd, fl_selection_length[1]);
-  if (strcmp(mime_type, wld_plain_text_clipboard) == 0 || strcmp(mime_type, "text/plain") == 0 || strcmp(mime_type, "image/bmp") == 0) {
+  if (((!strcmp(mime_type, wld_plain_text_clipboard) || !strcmp(mime_type, "text/plain")) && fl_selection_type[rank] == Fl::clipboard_plain_text)
+      ||
+    (!strcmp(mime_type, "image/bmp") && fl_selection_type[rank] == Fl::clipboard_image) ) {
     data_source_write_struct *write_data = new data_source_write_struct;
     write_data->rest = fl_selection_length[rank];
     write_data->from = fl_selection_buffer[rank];
     Fl::add_fd(fd, FL_WRITE, (Fl_FD_Handler)write_data_source_cb, write_data);
   } else {
-    Fl::error("Destination client requested unsupported MIME type: %s\n", mime_type);
+    //Fl::error("Destination client requested unsupported MIME type: %s\n", mime_type);
     close(fd);
   }
 }