Use MOZ_ENABLE_WAYLAND for Wayland launcher

mozilla-1522780.patch

@@ -0,0 +1,42 @@
+diff -up thunderbird-60.5.0/toolkit/xre/nsAppRunner.cpp.1522780 thunderbird-60.5.0/toolkit/xre/nsAppRunner.cpp
+--- thunderbird-60.5.0/toolkit/xre/nsAppRunner.cpp.1522780	2019-02-05 20:57:28.384820067 +0100
++++ thunderbird-60.5.0/toolkit/xre/nsAppRunner.cpp	2019-02-05 21:05:27.623511428 +0100
+@@ -3872,10 +3872,26 @@ int XREMain::XRE_mainStartup(bool* aExit
+       saveDisplayArg = true;
+     }
+ 
+-      // On Wayland disabled builds read X11 DISPLAY env exclusively
+-      // and don't care about different displays.
+-#if !defined(MOZ_WAYLAND)
+-    if (!display_name) {
++    bool disableWayland = true;
++#if defined(MOZ_WAYLAND)
++    // Make X11 backend the default one.
++    // Enable Wayland backend only when GDK_BACKEND is set and
++    // Gtk+ >= 3.22 where we can expect recent enough
++    // compositor & libwayland interface.
++    disableWayland = (PR_GetEnv("GDK_BACKEND") == nullptr) ||
++                     (gtk_check_version(3, 22, 0) != nullptr);
++    // Enable Wayland on Gtk+ >= 3.22 where we can expect recent enough
++    disableWayland = (gtk_check_version(3, 22, 0) != nullptr);
++    if (!disableWayland) {
++      // Make X11 backend the default one unless MOZ_ENABLE_WAYLAND or
++      // GDK_BACKEND are specified.
++      disableWayland = (PR_GetEnv("GDK_BACKEND") == nullptr) &&
++                       (PR_GetEnv("MOZ_ENABLE_WAYLAND") == nullptr);
++    }
++#endif
++    // On Wayland disabled builds read X11 DISPLAY env exclusively
++    // and don't care about different displays.
++    if (disableWayland && !display_name) {
+       display_name = PR_GetEnv("DISPLAY");
+       if (!display_name) {
+         PR_fprintf(PR_STDERR,
+@@ -3883,7 +3899,6 @@ int XREMain::XRE_mainStartup(bool* aExit
+         return 1;
+       }
+     }
+-#endif
+ 
+     if (display_name) {
+       mGdkDisplay = gdk_display_open(display_name);

thunderbird-wayland.sh.in

@@ -3,5 +3,10 @@
 # Run Thunderbird under Wayland
 #
 
-export GDK_BACKEND=wayland
+##
+## Enable Wayland backend?
+##
+if [ "$XDG_CURRENT_DESKTOP" == "GNOME" ]; then
+  export MOZ_ENABLE_WAYLAND=1
+fi
 exec /usr/bin/thunderbird "$@"

thunderbird.sh.in

@@ -36,13 +36,6 @@ MOZ_LANGPACKS_DIR="$MOZ_DIST_BIN/langpacks"
 MOZ_EXTENSIONS_PROFILE_DIR="$HOME/.mozilla/extensions/{3550f703-e582-4d05-9a08-453d09bdfdc6}"
 MOZ_LAUNCHER="$MOZ_DIST_BIN/thunderbird"
 
-##
-## Enable X11 backend by default?
-##
-if ! [ "$GDK_BACKEND" ]; then
-  export GDK_BACKEND=x11
-fi
-
 ##
 ## Set MOZ_ENABLE_PANGO is no longer used because Pango is enabled by default
 ## you may use MOZ_DISABLE_PANGO=1 to force disabling of pango

thunderbird.spec

@@ -82,7 +82,7 @@
 Summary:        Mozilla Thunderbird mail/newsgroup client
 Name:           thunderbird
 Version:        60.5.0
-Release:        3%{?dist}
+Release:        4%{?dist}
 URL:            http://www.mozilla.org/projects/thunderbird/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
 Group:          Applications/Internet
@@ -122,6 +122,7 @@ Patch309:       mozilla-1460871-ldap-query.patch
 
 # Fedora specific patches
 Patch311:       firefox-wayland.patch
+Patch312:       mozilla-1522780.patch
 
 # Upstream patches
 
@@ -256,6 +257,7 @@ debug %{name}, you want to install %{name}-debuginfo instead.
 #cd ..
 
 %patch311 -p1 -b .wayland
+%patch312 -p1 -b .1522780
 
 %if %{official_branding}
 # Required by Mozilla Corporation
@@ -676,6 +678,9 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #===============================================================================
 
 %changelog
+* Tue Feb 05 2019 Martin Stransky <stransky@redhat.com> - 60.5.0-4
+- Use MOZ_ENABLE_WAYLAND for Wayland launcher.
+
 * Tue Feb 05 2019 Martin Stransky <stransky@redhat.com> - 60.5.0-3
 - Updated Wayland patches