Merge r39595 from cling:

Reset the modifier before reading new input.
Fixes problem in cling where backspace would disable further input.


git-svn-id: http://root.cern.ch/svn/root/trunk@39596 27541ba8-7e3a-0410-8455-c3a389f83636

core/textinput/src/textinput/StreamReaderUnix.cpp

@@ -228,6 +228,7 @@ namespace textinput {
   bool
   StreamReaderUnix::ReadInput(size_t& nRead, InputData& in) {
     int c = ReadRawCharacter();
+    in.SetModifier(InputData::kModNone);
     if (c == -1) {
       in.SetExtended(InputData::kEIEOF);
     } else if (c == 0x1b) {