use QPlainTextEdit instead of QTextEdit

gui/qt/paytoedit.py

@@ -28,7 +28,7 @@ RE_ADDRESS = '[1-9A-HJ-NP-Za-km-z]{26,}'
 RE_ALIAS = '(.*?)\s*\<([1-9A-HJ-NP-Za-km-z]{26,})\>'
 
 frozen_style = "QWidget { background-color:none; border:none;}"
-normal_style = "QTextEdit { }"
+normal_style = "QPlainTextEdit { }"
 
 class PayToEdit(QRTextEdit):
 
@@ -39,8 +39,6 @@ class PayToEdit(QRTextEdit):
         self.document().contentsChanged.connect(self.update_size)
         self.heightMin = 0
         self.heightMax = 150
-        self.setMinimumHeight(27)
-        self.setMaximumHeight(27)
         self.c = None
         self.textChanged.connect(self.check_text)
         self.outputs = []
@@ -161,9 +159,11 @@ class PayToEdit(QRTextEdit):
 
     def update_size(self):
         docHeight = self.document().size().height()
-        if self.heightMin <= docHeight <= self.heightMax:
-            self.setMinimumHeight(docHeight + 2)
-            self.setMaximumHeight(docHeight + 2)
+        h = docHeight*17 + 11
+        if self.heightMin <= h <= self.heightMax:
+            self.setMinimumHeight(h)
+            self.setMaximumHeight(h)
+        self.verticalScrollBar().hide()
 
 
     def setCompleter(self, completer):
@@ -207,7 +207,7 @@ class PayToEdit(QRTextEdit):
             e.ignore()
             return
 
-        QTextEdit.keyPressEvent(self, e)
+        QPlainTextEdit.keyPressEvent(self, e)
 
         ctrlOrShift = e.modifiers() and (Qt.ControlModifier or Qt.ShiftModifier)
         if self.c is None or (ctrlOrShift and e.text().isEmpty()):

gui/qt/qrtextedit.py

@@ -2,7 +2,7 @@ from electrum.i18n import _
 from PyQt4.QtGui import *
 from PyQt4.QtCore import *
 
-class QRTextEdit(QTextEdit):
+class QRTextEdit(QPlainTextEdit):
 
     def __init__(self, text=None):
         QTextEdit.__init__(self, text)
@@ -11,11 +11,11 @@ class QRTextEdit(QTextEdit):
         self.button.setStyleSheet("QToolButton { border: none; padding: 0px; }")
         self.button.setVisible(True)
         self.button.clicked.connect(lambda: self.qr_show() if self.isReadOnly() else self.qr_input())
+        self.setText = self.setPlainText
         self.scan_f = self.setText
 
-
     def resizeEvent(self, e):
-        o = QTextEdit.resizeEvent(self, e)
+        o = QPlainTextEdit.resizeEvent(self, e)
         sz = self.button.sizeHint()
         frameWidth = self.style().pixelMetric(QStyle.PM_DefaultFrameWidth)
         self.button.move(self.rect().right() - frameWidth - sz.width(),