Bug 567485 - [GTK4] Cleanup old porting code - GtkBindingSet

- Put guard on on loading swt_functional_gtk_3_20.css, which has
invalide css flags in GTK4

- Added the functionality that was provided by the GtkBindingSet css is
ported using gtk_widget_class_add_binding_signal

Note: minor problem is that this fix is not 100%, the arrow keys don't
expand/collapse on the first click, creates a "invalid key" sound,
however responds correct after the second try. Reason of this is
happening is unclear.

Change-Id: Ibd416417decaff5314cda34daa1825a840ea184c
Signed-off-by: Paul D'Pong <sdamrong@redhat.com>
6 files changed
tree: c7c3e7eced1168387ed5ab70654d9f96e4b2d0b1
  1. bundles/
  2. container/
  3. examples/
  4. features/
  5. local-build/
  6. tests/
  7. .gitignore
  8. CONTRIBUTING
  9. LICENSE
  10. NOTICE
  11. pom.xml
  12. README.md
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