Show Sprout security warning

src/mainwindow.ui

@@ -22,7 +22,7 @@
     <item row="0" column="0">
      <widget class="QTabWidget" name="tabWidget">
       <property name="currentIndex">
-       <number>1</number>
+       <number>2</number>
       </property>
       <widget class="QWidget" name="tab">
        <attribute name="title">
@@ -730,6 +730,25 @@
                </item>
               </layout>
              </item>
+             <item>
+              <widget class="QLabel" name="lblSproutWarning">
+               <property name="styleSheet">
+                <string notr="true">color: red;</string>
+               </property>
+               <property name="text">
+                <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;You should suspend trust in the receipt of funds to Sprout z-addresses until you upgrade to zcash v2.0.4. See &lt;a href=&quot;https://z.cash/support/security/announcements/security-announcement-2019-03-19/&quot;&gt;&lt;span style=&quot; text-decoration: underline; color:#0000ff;&quot;&gt;Security Announcement&lt;/span&gt;&lt;/a&gt;.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+               </property>
+               <property name="textFormat">
+                <enum>Qt::RichText</enum>
+               </property>
+               <property name="wordWrap">
+                <bool>true</bool>
+               </property>
+               <property name="textInteractionFlags">
+                <set>Qt::TextBrowserInteraction</set>
+               </property>
+              </widget>
+             </item>
             </layout>
            </widget>
           </item>
@@ -1029,7 +1048,7 @@
      <x>0</x>
      <y>0</y>
      <width>968</width>
-     <height>19</height>
+     <height>22</height>
     </rect>
    </property>
    <widget class="QMenu" name="menuFile">

src/rpc.cpp

@@ -551,6 +551,7 @@ void RPC::getInfoThenRefresh(bool force) {
         static int    lastBlock = 0;
         int curBlock  = reply["blocks"].get<json::number_integer_t>();
         int version = reply["version"].get<json::number_integer_t>();
+        Settings::getInstance()->setZcashdVersion(version);
 
         if ( force || (curBlock != lastBlock) ) {
             // Something changed, so refresh everything.
@@ -646,7 +647,7 @@ void RPC::getInfoThenRefresh(bool force) {
             else {
                 tooltip = QObject::tr("zcashd has no peer connections");
             }
-            tooltip = tooltip % "(v " % QString::number(version) % ")";
+            tooltip = tooltip % "(v " % QString::number(Settings::getInstance()->getZcashdVersion()) % ")";
 
             if (!zecPrice.isEmpty()) {
                 tooltip = "1 ZEC = " % zecPrice % "\n" % tooltip;

src/settings.cpp

@@ -82,6 +82,14 @@ bool Settings::isTAddress(QString addr) {
     return addr.startsWith("t");
 }
 
+int Settings::getZcashdVersion() {
+    return _zcashdVersion;
+}
+
+void Settings::setZcashdVersion(int version) {
+    _zcashdVersion = version;
+}
+
 bool Settings::isSyncing() {
     return _isSyncing;
 }

src/settings.h

@@ -31,6 +31,9 @@ public:
     bool    isSyncing();
     void    setSyncing(bool syncing);
 
+    int     getZcashdVersion();
+    void    setZcashdVersion(int version);
+    
     void    setUseEmbedded(bool r) { _useEmbedded = r; }
     bool    useEmbedded() { return _useEmbedded; }
 
@@ -105,6 +108,7 @@ private:
     bool    _isTestnet        = false;
     bool    _isSyncing        = false;
     int     _blockNumber      = 0;
+    int     _zcashdVersion    = 0;
     bool    _useEmbedded      = false;
     bool    _headless         = false;
     int     _peerConnections  = 0;