Account for 'Show virtual space at bottom of page' intellij setting

[supex0fan]

If the 'Show virtual space at bottom of page' setting is enabled, one page worth of lines are added to the highlighted (visible) section of the glance panel.

Note: If a user is on in a file with the setting disabled, then enables the setting, the plugin won't update until the file is reopened.

Before the Commit:

After the Commit: