review request - RT-34191 Lens: [touch] wrong logic for drag starting outside a window

[Assaf Yavnai]

JIRA - RT-34191 <https://javafx-jira.kenai.com/browse/RT-34191>(webrev 
attached)

Summary:
2 problems where identified:
1) the logic issue described above
2) native mouse drag detection was relaying on an obsolete variable

Fixing item 2 also solved RT-34137 
<https://javafx-jira.kenai.com/browse/RT-34137>

Unit tests were also updated to reflect the change of logic

Attaching fix patches

Fix was tested using helloworld.HelloSanity, BrickBreaker, 
FXML-LoginDemo, Calculator and LinuxInputTest