IDEA-89720 Preview usages: "select usages to preview" should be shown at the center of panel
Cleanup (test)
java: no need to check package prefix for annotations on ref adjustment
Cleanup (test)

- Groovy tests moved to corresponding module
- assertions cleaned
- parasitic exceptions suppressed
WI-14476 When hovering over variable, Expression Evaluation tooltip disappears before I can click the + icon (cherry picked from commit 3034e98)
Quick fix for not Unity window managers. Should be moved into linux-specific code.
Eliminated dependencies on pthread, glib rec mutex synchronization. A crash fixed.
IDEA-116125 extra gutter in presentation mode