* Fix Gtk-Critical assertion in PresetComboBoxes
Resolve the `gtk_cell_layout_get_cells: assertion GTK_IS_CELL_LAYOUT
failed` error by switching from `gtk_cell_layout_get_cells()` to
`gtk_container_get_children()` with direct PangoLayout ellipsization
on GtkEntry widgets.
Picked from PrusaSlicer:
https://github.com/prusa3d/PrusaSlicer/commit/e855ab5d
* Add defensive guards for GTK widget sizing
Fix Gtk-CRITICAL assertions in TextInput and DropDown widgets that
occur when the widget attempt relative sizing against window size
before GTK completes the window layout.
Changes include:
- TextInput.cpp: Clamp textSize.x >= -1 to prevent
`gtk_widget_set_size_request` failures.
- Picked from Prusa Slicer:
https://github.com/prusa3d/PrusaSlicer/commit/e855ab5d
- DropDown.cpp: Guard against zero/negative dimensions during early
initialization:
- Prevent szContent.x = 0 when parent size is unavailable.
- Unique to OrcaSlicer
- Triggers during initializing DesignerPanel --> BasicInfo -->
License DropDown before a parent size is available.
- Latent bug exists in Bambu Studio, but Bambu does not have
License field enabled on this panel.
- Created global guard for future resilience.
- Clamp szContent.y >= 1 for dropdowns before content initialized.
- Bug exists in BambuStudio
- Prusa did not implement the "ENH: ComboBox Second DropDown"
