Bug 573387 - [GTK4] ControlExample fix errors due to GTK3 only functions

- Moved gtk_widget_add_events & their corresponding mask into GTK3 only
- In Text, moved gtk_entry_set_width_chars into previous style check for
SWT.SINGLE and into GTK3 guard
- Replaced gtk_entry_get_layout with GTK4 equivalent
- Proper GTK4 font description retrieval in getFontDescription
- Place gtk_widget_set_redraw_on_allocate &
gtk_widget_set_double_buffered behind GTK3 only guard

Change-Id: I589dc8cf24add948d79b7e527b0868fd9021b41c
Signed-off-by: Paul D'Pong <sdamrong@redhat.com>
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.swt/+/180552
Tested-by: Platform Bot <platform-bot@eclipse.org>
Reviewed-by: Alexander Kurtakov <akurtako@redhat.com>
5 files changed
tree: 0762a280a6b793730373699f9c4608628d20bdde
  1. .gitignore
  5. README.md
  6. bundles/
  7. container/
  8. examples/
  9. features/
  10. local-build/
  11. pom.xml
  12. tests/

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