show number of confirmations remaining for staking to be active

enhancements
cleanup
rename min to max
wording and spelling
more UI enhancements/ edge case support
better staking status alignment
color indicates wallet status. toggle indicates intent.
new icons (needs resizing and fixing up)
small change for code reduction and clarity
make it more readable
additional check borrowed from MintableCoins(). less than equals sanity
svg and png toggle standardizations. move QString to top.
adjust offset with adjusted icon
create common shared IsStakingActive code in wallet.cpp
log print removal cleanup. qt makefile additions
IsStakingActive() check now leverages mining check for stakable inputs
clear mapHashedBlocks when staking thread exits

src/Makefile.qt.include

@@ -417,6 +417,9 @@ RES_ICONS = \
   qt/res/icons/[email protected] \
   qt/res/icons/[email protected] \
   qt/res/icons/ic-switch-on.png \
+  qt/res/icons/ic-switch-on-grey.png \
+  qt/res/icons/[email protected] \
+  qt/res/icons/[email protected] \
   qt/res/icons/[email protected] \
   qt/res/icons/ic-progress-10-10.png \
   qt/res/icons/[email protected] \
@@ -552,6 +555,9 @@ RES_ICONS = \
   qt/res/icons/ic-progress-6-6-complete-14x14.png \
   qt/res/icons/ic-switch-on.png \
   qt/res/icons/ic-switch-off.png \
+  qt/res/icons/ic-switch-off-blue.png \
+  qt/res/icons/[email protected] \
+  qt/res/icons/[email protected] \
   qt/res/icons/ic-addresses.png \
   qt/res/icons/ic-transactions.png \
   qt/res/icons/ic-send.png \

src/interfaces/wallet.cpp

@@ -307,6 +307,7 @@ class WalletImpl : public Wallet
     }
     void setStakingEnabled(bool fEnableStaking) override { m_wallet.SetStakingEnabled(fEnableStaking); }
     bool isStakingEnabled() override { return m_wallet.IsStakingEnabled(); }
+    bool isStakingActive() override { return m_wallet.IsStakingActive(); }
 
     void abortRescan() override { m_wallet.AbortRescan(); }
     bool backupWallet(const std::string& filename) override { return m_wallet.BackupWallet(filename); }

src/interfaces/wallet.h

@@ -302,6 +302,9 @@ class Wallet
     virtual void setStakingEnabled(bool fEnableStaking) = 0;
     virtual bool isStakingEnabled() = 0;
 
+    //! Return whether wallet is actively staking.
+    virtual bool isStakingActive() = 0;
+
     //! Register handler for unload message.
     using UnloadFn = std::function<void()>;
     virtual std::unique_ptr<Handler> handleUnload(UnloadFn fn) = 0;

src/miner.cpp

@@ -898,6 +898,7 @@ void BitcoinMiner(std::shared_ptr<CReserveScript> coinbaseScript, bool fProofOfS
             }
 
             if (!pwallet || !pwallet->IsStakingEnabled() || (pwallet->IsLocked() && !pwallet->IsUnlockedForStakingOnly())) {
+				mapHashedBlocks.clear();
                 MilliSleep(5000);
                 continue;
             }
@@ -1213,7 +1214,7 @@ void ThreadStakeMiner()
             LogPrintf("%s: interrupted\n", __func__);
         }
     }
-
+    mapHashedBlocks.clear();
     LogPrintf("%s: exiting\n", __func__);
 }
 

src/qt/res/css/main.css

@@ -698,19 +698,6 @@ QCheckBox#checkStaking::indicator {
     height:25px;
 }
 
-QCheckBox#checkStaking {
-    background-image: url(":/icons/ic-switch-off-png");
-    background-repeat:no-repeat;
-    background-position:left center;
-    color:#bababa;
-    margin-right:5px;
-}
-
-QCheckBox#checkStaking:checked {
-    background-image: url(":/icons/ic-switch-on-png");
-    color:#105aef;
-}
-
 QPushButton#btnSync{
     color:#707070;
     border:none;