vncviewer: fix clipboard check incorrectly rejecting PRIMARY selections

Resolves: RHEL-192138

tigervnc-vncviewer-fix-clipboard-check-incorrectly-rejecting-primary-selection.patch

@@ -0,0 +1,29 @@
+From 763c9d1a80b0333cc248d78e135309013dd68f9f Mon Sep 17 00:00:00 2001
+From: Jan Grulich <jgrulich@redhat.com>
+Date: Fri, 31 Jul 2026 13:42:48 +0200
+Subject: [PATCH] vncviewer: fix clipboard check incorrectly rejecting PRIMARY
+ selections
+
+Fl::clipboard_contains() doesn't query PRIMARY selection. When text is
+selected, the clipboard notify is sent with source=0 (PRIMARY), but the
+check performed by Fl::clipboard_contains() might be checking clipboard
+which may be empty, causing a false "Got non-plain text" rejection.
+
+Fixes #2129
+---
+ vncviewer/Viewport.cxx | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/vncviewer/Viewport.cxx b/vncviewer/Viewport.cxx
+index 251b5ece5a..c3919f4d06 100644
+--- a/vncviewer/Viewport.cxx
++++ b/vncviewer/Viewport.cxx
+@@ -595,7 +595,7 @@ void Viewport::handleClipboardChange(int source, void *data)
+     return;
+ #endif
+ 
+-  if (!Fl::clipboard_contains(Fl::clipboard_plain_text)) {
++  if (source != 0 && !Fl::clipboard_contains(Fl::clipboard_plain_text)) {
+     vlog.debug("Got non-plain text in local clipboard, ignoring.");
+     // Reset the state as if we don't have any clipboard data at all
+     self->pendingClientClipboard = false;

tigervnc.spec

@@ -5,7 +5,7 @@
 
 Name:           tigervnc
 Version:        1.16.2
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        A TigerVNC remote display system
 
 %global _hardened_build 1
@@ -31,6 +31,8 @@ Patch3:         tigervnc-add-option-allowing-to-connect-only-user-owning-session
 Patch4:         tigervnc-allow-use-of-passwords-longer-than-eight-characters.patch
 
 # Upstream patches
+# https://github.com/TigerVNC/tigervnc/pull/2135
+Patch10:        tigervnc-vncviewer-fix-clipboard-check-incorrectly-rejecting-primary-selection.patch
 
 # Upstreamable patches
 
@@ -209,6 +211,7 @@ popd
 %patch -P4 -p1 -b .allow-use-of-passwords-longer-than-eight-characters
 
 # Upstream patches
+%patch -P10 -p1 -b .vncviewer-fix-clipboard-check-incorrectly-rejecting-primary-selection
 
 # Upstreamable patches
 
@@ -388,6 +391,10 @@ fi
 %ghost %verify(not md5 size mode mtime) %{_sharedstatedir}/selinux/%{selinuxtype}/active/modules/200/%{modulename}
 
 %changelog
+* Thu Aug 06 2026 Jan Grulich <jgrulich@redhat.com> - 1.16.2-4
+- vncviewer: fix clipboard check incorrectly rejecting PRIMARY selections
+  Resolves: RHEL-192138
+
 * Thu Jun 25 2026 Jan Grulich <jgrulich@redhat.com> - 1.16.2-3
 - Rebuild for updated xorg-x11-server
   Resolves: RHEL-184004