special treatment for various kinds of selections: imitate normal flow of editing;

merged

do not absorb vacuous copy operation, e.g. relevant when tooltip has focus but no selection, while the main text area has a selection but no focus;

check global mouse status before opening tooltip, e.g. relevant when the mouse has moved outside the window and mouse events are no longer seen by this component;

dismiss all popups on mouse drags, e.g. to avoid conflict of C-hover of Isabelle/jEdit and C-selection of jEdit;

tuned proofs

minimized imports

merged

tuned rendering -- change mouse pointer for active areas;

propagate deps_changed, to resolve missing files without requiring jEdit events (e.g. buffer load/save); tuned signature;