[LLDB][GUI] Fix text field incorrect key handling

[OmarEmaraDev]

Summary

The isprint libc function was used to determine if the key code
represents a printable character. The problem is that the specification
leaves the behavior undefined if the key is not representable as an
unsigned char, which is the case for many ncurses keys. This patch adds
and explicit check for this undefined behavior and make it consistent.

The llvm::isPrint function didn't work correctly for some reason, most
likely because it takes a char instead of an int, which I guess makes it
unsuitable for checking ncurses key codes.

[clayborg]

This works much better now!

lldb/source/Core/IOHandlerCursesGUI.cpp

void RemoveChar() {
 
     m_content.erase(m_cursor_position - 1, 1);
     m_cursor_position--;
     ScrollLeft();
   }
 
   // True if the key represents a char that can be inserted in the field
   // content, false otherwise.
-  virtual bool IsAcceptableChar(int key) { return isprint(key); }
+  virtual bool IsAcceptableChar(int key) {
+    // The behavior of isprint is undefined when the value is not representable
+    // as an unsigned char. So explicitly check for non-ascii key codes.
+    if (key > 127)
+      return false;
+    return isprint(key);
+  }
 
   HandleCharResult FieldDelegateHandleChar(int key) override {
     if (IsAcceptableChar(key)) {
       ClearError();
       InsertChar((char)key);
       return eKeyHandled;
     }