Utils: Allow combining add multi cursor events with shift

The old block selection shortcuts were used with alt + shift + up/down,
but the new multi text cursor were just expecting alt + direction key
for adding new cursors. In order to not break with habbits also ignore
shift modifier when checking for alt + cursor move key events.

Fixes: QTCREATORBUG-26503
Change-Id: I064e666a04b88c3b90d10ea35688613159f7d4a5
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/libs/utils/multitextcursor.cpp

@@ -296,7 +296,10 @@ static QTextLine currentTextLine(const QTextCursor &cursor)
 bool multiCursorAddEvent(QKeyEvent *e, QKeySequence::StandardKey matchKey)
 {
     uint searchkey = (e->modifiers() | e->key())
-                     & ~(Qt::KeypadModifier | Qt::GroupSwitchModifier | Qt::AltModifier);
+                     & ~(Qt::KeypadModifier
+                         | Qt::GroupSwitchModifier
+                         | Qt::AltModifier
+                         | Qt::ShiftModifier);
 
     const QList<QKeySequence> bindings = QKeySequence::keyBindings(matchKey);
     return bindings.contains(QKeySequence(searchkey));