X11: Add two Preferences to optional tracking clipboard or selection tracking

config.cc

@@ -237,6 +237,10 @@ Preferences::Preferences():
   ignoreDiacritics( false ),
   ignorePunctuation( false ),
 #ifdef HAVE_X11
+  // Enable both Clipboard and Selection by default so that X users can enjoy full
+  // power and disable optionally.
+  trackClipboardScan ( true ),
+  trackSelectionScan ( true ),
   showScanFlag( false ),
 #endif
   pronounceOnLoadMain( false ),
@@ -895,6 +899,8 @@ Class load()
     if( !preferences.namedItem( "ignorePunctuation" ).isNull() )
       c.preferences.ignorePunctuation = ( preferences.namedItem( "ignorePunctuation" ).toElement().text() == "1" );
 #ifdef HAVE_X11
+    c.preferences.trackClipboardScan= ( preferences.namedItem( "trackClipboardScan" ).toElement().text() == "1" );
+    c.preferences.trackSelectionScan= ( preferences.namedItem( "trackSelectionScan" ).toElement().text() == "1" );
     c.preferences.showScanFlag= ( preferences.namedItem( "showScanFlag" ).toElement().text() == "1" );
 #endif
 
@@ -1775,6 +1781,14 @@ void save( Class const & c )
     preferences.appendChild( opt );
 
 #ifdef HAVE_X11
+    opt = dd.createElement( "trackClipboardScan" );
+    opt.appendChild( dd.createTextNode( c.preferences.trackClipboardScan ? "1":"0" ) );
+    preferences.appendChild( opt );
+
+    opt = dd.createElement( "trackSelectionScan" );
+    opt.appendChild( dd.createTextNode( c.preferences.trackSelectionScan ? "1":"0" ) );
+    preferences.appendChild( opt );
+
     opt = dd.createElement( "showScanFlag" );
     opt.appendChild( dd.createTextNode( c.preferences.showScanFlag? "1":"0" ) );
     preferences.appendChild( opt );

config.hh

@@ -329,6 +329,8 @@ struct Preferences
   bool ignoreDiacritics;
   bool ignorePunctuation;
 #ifdef HAVE_X11
+  bool trackClipboardScan;
+  bool trackSelectionScan;
   bool showScanFlag;
 #endif
 

preferences.cc

@@ -251,8 +251,12 @@ Preferences::Preferences( QWidget * parent, Config::Class & cfg_ ):
 //Platform-specific options
 
 #ifdef HAVE_X11
-  ui.showScanFlag->setChecked( p.showScanFlag);
+  ui.enableX11SelectionTrack->setChecked(p.trackSelectionScan);
+  ui.enableClipboardTrack ->setChecked(p.trackClipboardScan);
+  ui.showScanFlag->setChecked(p.showScanFlag);
 #else
+  ui.enableX11SelectionTrack->hide();
+  ui.enableClipboardTrack->hide();
   ui.showScanFlag->hide();
   ui.ignoreOwnClipboardChanges->hide();
 #endif
@@ -422,6 +426,8 @@ Config::Preferences Preferences::getPreferences()
   p.ignoreOwnClipboardChanges = ui.ignoreOwnClipboardChanges->isChecked();
   p.scanToMainWindow = ui.scanToMainWindow->isChecked();
 #ifdef HAVE_X11
+  p.trackSelectionScan = ui.enableX11SelectionTrack ->isChecked();
+  p.trackClipboardScan = ui.enableClipboardTrack ->isChecked();
   p.showScanFlag= ui.showScanFlag->isChecked();
 #endif
 

preferences.ui

@@ -711,6 +711,29 @@ seconds, which is specified here.</string>
          </property>
         </widget>
        </item>
+       <item>
+        <widget class="QGroupBox" name="enableX11SelectionTrack">
+         <property name="title">
+          <string>Track Selection change</string>
+         </property>
+         <property name="checkable">
+          <bool>true</bool>
+         </property>
+         <property name="checked">
+          <bool>false</bool>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QCheckBox" name="enableClipboardTrack">
+         <property name="toolTip">
+          <string>Track clipboard changes when Scanning is enabled. Noice! You should always enable this unless you are on Linux.</string>
+         </property>
+         <property name="text">
+          <string>Track Clipboard change</string>
+         </property>
+        </widget>
+       </item>
        <item>
         <spacer name="verticalSpacer_6">
          <property name="orientation">