Bug 1679076 - Recognize sway as desktop environment. r=gfx-reviewers,jrmuizel

Differential Revision: https://phabricator.services.mozilla.com/D127986

widget/GfxDriverInfo.cpp

@@ -812,6 +812,7 @@ const nsAString& GfxDriverInfo::GetDesktopEnvironment(DesktopEnvironment id) {
     DECLARE_DESKTOP_ENVIRONMENT_ID(LXDE, "lxde");
     DECLARE_DESKTOP_ENVIRONMENT_ID(Openbox, "openbox");
     DECLARE_DESKTOP_ENVIRONMENT_ID(i3, "i3");
+    DECLARE_DESKTOP_ENVIRONMENT_ID(Sway, "sway");
     DECLARE_DESKTOP_ENVIRONMENT_ID(Mate, "mate");
     DECLARE_DESKTOP_ENVIRONMENT_ID(Unity, "unity");
     DECLARE_DESKTOP_ENVIRONMENT_ID(Pantheon, "pantheon");

widget/GfxDriverInfo.h

@@ -268,6 +268,7 @@ enum class DesktopEnvironment : uint8_t {
   Deepin,
   Dwm,
   Budgie,
+  Sway,
   Unknown,
   Max
 };

widget/gtk/GfxInfo.cpp

@@ -540,6 +540,10 @@ void GfxInfo::GetData() {
       CopyUTF16toUTF8(
           GfxDriverInfo::GetDesktopEnvironment(DesktopEnvironment::i3),
           mDesktopEnvironment);
+    } else if (currentDesktop.find("sway") != std::string::npos) {
+      CopyUTF16toUTF8(
+          GfxDriverInfo::GetDesktopEnvironment(DesktopEnvironment::Sway),
+          mDesktopEnvironment);
     } else if (currentDesktop.find("mate") != std::string::npos) {
       CopyUTF16toUTF8(
           GfxDriverInfo::GetDesktopEnvironment(DesktopEnvironment::Mate),