Fix Bug 318453 - Blinking cursor of "fullwidth" character are "halfwidth"

Calculate the character width at current blinking cursor.

BUG: 318453

src/TerminalDisplay.cpp

@@ -1600,7 +1600,9 @@ void TerminalDisplay::blinkCursorEvent()
 
 void TerminalDisplay::updateCursor()
 {
-    QRect cursorRect = imageToWidget(QRect(cursorPosition(), QSize(1, 1)));
+    int cursorLocation = loc(cursorPosition().x(), cursorPosition().y());
+    int charWidth = konsole_wcwidth(_image[cursorLocation].character);
+    QRect cursorRect = imageToWidget(QRect(cursorPosition(), QSize(charWidth, 1)));
     update(cursorRect);
 }