Removed GTK2 compatibility shims from headers (fe-gtk.h, gtkutil.h), leaving direct GTK3-facing declarations/includes only (and platform-specific guards unrelated to GTK2 kept as-is).
Cleaned GTK2-specific comments/wording now that behavior is GTK3-native (menu accelerator note and emoji/userlist comment blocks).
Initialized each new channel row with PANGO_UNDERLINE_NONE so only the active channel gets emphasized.
Updated tree selection handling to remove underline from the previously focused row and apply PANGO_UNDERLINE_SINGLE to the newly selected row, creating a clear “currently viewed channel” indicator.
Bound the channel name renderer’s underline property to the new model column so underline changes are reflected immediately in the channel list UI.
Updated user list creation to apply the current input font in GTK3 when palette styling is applied, so the user list reflects font changes consistently.
Updated channel view creation in GTK3 to always pass the current input font to chanview_new, ensuring channel list typography starts with the configured font.
Updated settings re-apply logic to always include the current input font for the user list in GTK3, so runtime font updates take effect there as well.
Guarded tree view palette application to use GTK3 font descriptions or GTK2 styles appropriately.
Adjusted the chanview creation call site to pass GTK3 font descriptions or GTK2 styles based on the build.
Switched channel tree and theme application logic to use the new palette helper.
Updated entry and user list styling to route palette/font application through the helper.
Applied gtk_box_set_homogeneous() in GTK3 branches where the GTK2 code requested homogeneous layout (e.g., dialog hboxes).
Updated remaining helpers and setup/preferences UI box constructors (including the shared mg_box_new helper) to follow the same GTK3/GTK2 branching approach consistently across src/fe-gtk/
- Replaced the dark mode checkbox with an Auto/Dark/Light color mode selector and ensured palette edits use the resolved mode.
- Applied the resolved color mode consistently across palette saving and GTK styling in the user list and channel tree/theme application paths.
- Removes need to check for malloc failure
- Removes need for NULL checks on free
- Adds checks for integer overflows
- Removes some extra memset calls
- Removes chance of mixing libc and glib malloc/free
