Glib warnings and errors generated in console

[Arthur Borsboom]

In xpad 4.2 rev 648 (development version) for a yet unknown reason the following errors appear in the console.

(xpad:1776): GLib-GObject-WARNING **: invalid unclassed pointer in cast to 'XpadToolbar'

(xpad:1776): GLib-GObject-WARNING **: invalid unclassed pointer in cast to 'GObject'

(xpad:1776): GLib-GObject-CRITICAL **: g_object_get_data: assertion 'G_IS_OBJECT (object)' failed

(xpad:1776): GLib-GObject-WARNING **: invalid unclassed pointer in cast to 'GObject'

(xpad:1776): GLib-GObject-CRITICAL **: g_object_set_data: assertion 'G_IS_OBJECT (object)' failed

[Arthur Borsboom (arthurborsboom)]

Reproduce by:

- Start Xpad
- Open a pad
- Select a text
- Right click on the selected text
- Choose CUT

[Arthur Borsboom (arthurborsboom)]

The reproduction scenario above is incorrect.

[Arthur Borsboom (arthurborsboom)]

Yes! I have found the right way of reproducing the issue.

- Start Xpad
- Open 2 pads
- Type in Pad 1 something
- Cut or copy a piece of text
- Delete pad 1
- Select text in pad 2
- Cut or copy a piece of text

[Arthur Borsboom (arthurborsboom)]

Getting closer...

- Start Xpad
- Open 2 pads
- Type in Pad 1 something
- Cut or copy a piece of text
- Delete pad 1
- Rightclick in pad 2
- (De)select [Hide toolbar]

[Arthur Borsboom (arthurborsboom)]

The origins of this issue were the incomplete/incorrect implementation of the dispose and finalize functions, and signal handler calls to non-existing objects.

This issue has been corrected, including different memory leaks which came along the path.
Fix will be released with v4.2