From 25047eb3e93582b68aad6be7251cf7c4ec962fc8 Mon Sep 17 00:00:00 2001
From: "Wladimir J. van der Laan" <laanwj@gmail.com>
Date: Thu, 17 May 2012 12:10:15 +0200
Subject: [PATCH 1/2] Filter out whitespace and zero-width non-breaking spaces
 in validator

- Fixes issues with copy/pasting from web or html emails (#1325)
---
 src/qt/bitcoinaddressvalidator.cpp | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/src/qt/bitcoinaddressvalidator.cpp b/src/qt/bitcoinaddressvalidator.cpp
index 373877808f7..c804ad0d576 100644
--- a/src/qt/bitcoinaddressvalidator.cpp
+++ b/src/qt/bitcoinaddressvalidator.cpp
@@ -21,9 +21,12 @@ BitcoinAddressValidator::BitcoinAddressValidator(QObject *parent) :
 QValidator::State BitcoinAddressValidator::validate(QString &input, int &pos) const
 {
     // Correction
-    for(int idx=0; idx<input.size(); ++idx)
+    for(int idx=0; idx<input.size();)
     {
-        switch(input.at(idx).unicode())
+        bool removeChar = false;
+        QChar ch = input.at(idx);
+        // Transform characters that are visually close
+        switch(ch.unicode())
         {
         case 'l':
         case 'I':
@@ -33,9 +36,22 @@ QValidator::State BitcoinAddressValidator::validate(QString &input, int &pos) co
         case 'O':
             input[idx] = QChar('o');
             break;
+        // Qt categorizes these as "Other_Format" not "Separator_Space"
+        case 0x200B: // ZERO WIDTH SPACE
+        case 0xFEFF: // ZERO WIDTH NO-BREAK SPACE
+            removeChar = true;
+            break;
         default:
             break;
         }
+        // Remove whitespace
+        if(ch.isSpace())
+            removeChar = true;
+        // To next character
+        if(removeChar)
+            input.remove(idx, 1);
+        else
+            ++idx;
     }
 
     // Validation

From ce7896070cc0adbf973e1714fba6a729c1df1411 Mon Sep 17 00:00:00 2001
From: "Wladimir J. van der Laan" <laanwj@gmail.com>
Date: Fri, 18 May 2012 08:53:26 +0200
Subject: [PATCH 2/2] Remove autocorrection of 0/i in addresses in UI

---
 src/qt/bitcoinaddressvalidator.cpp | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/src/qt/bitcoinaddressvalidator.cpp b/src/qt/bitcoinaddressvalidator.cpp
index c804ad0d576..d2b93e70f5b 100644
--- a/src/qt/bitcoinaddressvalidator.cpp
+++ b/src/qt/bitcoinaddressvalidator.cpp
@@ -25,17 +25,11 @@ QValidator::State BitcoinAddressValidator::validate(QString &input, int &pos) co
     {
         bool removeChar = false;
         QChar ch = input.at(idx);
-        // Transform characters that are visually close
+        // Corrections made are very conservative on purpose, to avoid
+        // users unexpectedly getting away with typos that would normally
+        // be detected, and thus sending to the wrong address.
         switch(ch.unicode())
         {
-        case 'l':
-        case 'I':
-            input[idx] = QChar('1');
-            break;
-        case '0':
-        case 'O':
-            input[idx] = QChar('o');
-            break;
         // Qt categorizes these as "Other_Format" not "Separator_Space"
         case 0x200B: // ZERO WIDTH SPACE
         case 0xFEFF: // ZERO WIDTH NO-BREAK SPACE