SYNERGY-538 - Allow Windows to go to sleep depending on system preferences (#6997)

* Disable thread execution state changes preventing the system from going to sleep

* Update changelog

* Remove leftover code affecting display and system power off

Co-authored-by: SerhiiGadzhilov <71632867+SerhiiGadzhilov@users.noreply.github.com>

ChangeLog

@@ -4,6 +4,7 @@ Bug fixes:
 - #7016 Fix script that generates version number
 - #7006 Resolve code scanning issues
 - #7012 Fix natural horizontal scrolling on Mac client
+- #6997 Allow Windows to go to sleep depending on system preferences
 
 Enhancements:
 - #6998 Remove functionality related to the screen saver synchronisation

src/lib/platform/MSWindowsScreen.cpp

@@ -247,12 +247,6 @@ MSWindowsScreen::enable()
         // watch jump zones
         m_hook.setMode(kHOOK_WATCH_JUMP_ZONE);
     }
-    else {
-        // prevent the system from entering power saving modes.  if
-        // it did we'd be forced to disconnect from the server and
-        // the server would not be able to wake us up.
-        ArchMiscWindows::addBusyState(ArchMiscWindows::kSYSTEM);
-    }
 }
 
 void
@@ -268,11 +262,6 @@ MSWindowsScreen::disable()
         // enable special key sequences on win95 family
         enableSpecialKeys(true);
     }
-    else {
-        // allow the system to enter power saving mode
-        ArchMiscWindows::removeBusyState(ArchMiscWindows::kSYSTEM |
-                            ArchMiscWindows::kDISPLAY);
-    }
 
     // tell key state
     m_keyState->disable();
@@ -1503,18 +1492,12 @@ MSWindowsScreen::onScreensaver(bool activated)
             m_screensaver->checkStarted(SYNERGY_MSG_SCREEN_SAVER, FALSE, 0)) {
             m_screensaverActive = true;
             sendEvent(m_events->forIPrimaryScreen().screensaverActivated());
-
-            // enable display power down
-            ArchMiscWindows::removeBusyState(ArchMiscWindows::kDISPLAY);
         }
     }
     else {
         if (m_screensaverActive) {
             m_screensaverActive = false;
             sendEvent(m_events->forIPrimaryScreen().screensaverDeactivated());
-
-            // disable display power down
-            ArchMiscWindows::addBusyState(ArchMiscWindows::kDISPLAY);
         }
     }
 

src/lib/platform/MSWindowsScreenSaver.cpp

@@ -113,9 +113,6 @@ MSWindowsScreenSaver::enable()
     if (m_wasSecure) {
         setSecure(true, m_wasSecureAnInt);
     }
-
-    // restore display power down
-    ArchMiscWindows::removeBusyState(ArchMiscWindows::kDISPLAY);
 }
 
 void
@@ -129,9 +126,6 @@ MSWindowsScreenSaver::disable()
     if (m_wasSecure) {
         setSecure(false, m_wasSecureAnInt);
     }
-
-    // disable display power down
-    ArchMiscWindows::addBusyState(ArchMiscWindows::kDISPLAY);
 }
 
 void
@@ -148,9 +142,6 @@ MSWindowsScreenSaver::activate()
             // no foreground window.  pretend we got the event instead.
             DefWindowProc(NULL, WM_SYSCOMMAND, SC_SCREENSAVE, 0);
         }
-
-        // restore power save when screen saver activates
-        ArchMiscWindows::removeBusyState(ArchMiscWindows::kDISPLAY);
     }
 }
 
@@ -188,9 +179,6 @@ MSWindowsScreenSaver::deactivate()
                                 !m_wasEnabled, 0, SPIF_SENDWININICHANGE);
     SystemParametersInfo(SPI_SETSCREENSAVEACTIVE,
                                  m_wasEnabled, 0, SPIF_SENDWININICHANGE);
-
-    // disable display power down
-    ArchMiscWindows::removeBusyState(ArchMiscWindows::kDISPLAY);
 }
 
 bool