This way, we can compare with literally the previous allocation and the
size will not be influenced by an adjusted allocation.
But more importantly, we can now use the transform/width/height values
for other stuff.
It's not priv->transform (to be turned into a graphene matrix),
priv->width and priv->height.
The numbers are still the same.
The only difference is that unallocated widgets will now have x/y set to
0, not to -1.
Make items-changed never emit 2 signals, instead, always emit only one,
potentially by extending the range reported in items-changed.
And be a lot more exhaustive about autoselect tests.
1. Do not make position an inout variable
The function is meant to return a range for a given position, not modify
a position. So it makes no conceptual sense to use an inout variable.
2. Pass the selected state as an out variable
Using a boolean return value - in particular in an interface full of
boolean return values - makes the return value intuitively feel like a
success/failure return. Using an out variable clarifies the usage.
3. Allow passing every position value
Define what happens when position >= list.n_items
4. Clarify the docs about how this function should behave
In particular, mention the case from point (3)
5. Add more tests
Again, (3) needs testing.
We need to remove the weak pointer, as the stack switcher can
keep the list model alive beyond the stack. This was observed
to cause crashes:
==16870== Invalid write of size 8
==16870== at 0x5168A4E: g_nullify_pointer (gutils.c:2284)
==16870== by 0x522C500: weak_refs_notify (gobject.c:2791)
==16870== by 0x50FE7BC: g_data_set_internal (gdataset.c:407)
==16870== by 0x50FECA7: g_datalist_id_set_data_full (gdataset.c:670)
==16870== by 0x5227EB4: g_object_real_dispose (gobject.c:1056)
==16870== by 0x522D295: g_object_unref (gobject.c:3309)
==16870== by 0x4AF849F: unset_stack (gtkstackswitcher.c:428)
==16870== by 0x4AF892E: gtk_stack_switcher_dispose (gtkstackswitcher.c:527)
It is easy to emit wrong ::selection-changed signals,
and then bad things will usually happen later. Add
some sanity checks to gtk_selection_model_selection_changed
to make this easier to track down.
Make GtkStackSidebar and GtkStack communicate via
the selection model that GtkStack now exposes.
This is parallel to the GtkStackSwitcher changes
in the previous commit.
If the recoloring would end up multiplying the alpha component with 0
anyway, just skip drawing anything altogether.
This increases the icon count in the switch demo of the fishbowl from
~260 to ~280 on my system.
Specifically it is avoided to be toggled if:
- Just received focus (in order to preserve OSK state across focus changes)
- Moving cursor around. Still allow some jitter as perfect accuracy is not
possible.
Closes: https://gitlab.gnome.org/GNOME/gtk/issues/1277
