* src/pgtkterm.c (pgtk_free_frame_resources)
(fill_background_by_face)
(pgtk_draw_glyphless_glyph_string_foreground)
(pgtk_draw_window_cursor): Fix coding style.
(pgtk_focus_frame): Use gtk_window_present_with_time whenever
possible.
(key_press_event): Set the last user time.
(pgtk_display_info_for_display): New function.
(key_release_event, construct_mouse_click, button_event): Set
the last user time.
(scroll_event, pgtk_parse_color, syms_of_pgtkterm)
(pgtk_begin_cr_clip): Fix coding style.
* src/pgtkterm.h (struct pgtk_output): New field
`last_user_time'.

* lisp/loadup.el (featurep): Load `pgtk-dnd'.
* lisp/pgtk-dnd.el: New file.
(pgtk-dnd-test-function, pgtk-dnd-types-alist)
(pgtk-dnd-known-types, pgtk-dnd-use-offix-drop)
(pgtk-dnd-current-state, pgtk-get-selection-internal)
(pgtk-register-dnd-targets, pgtk-dnd-empty-state)
(pgtk-dnd-init-frame, pgtk-dnd-get-state-cons-for-frame)
(pgtk-dnd-get-state-for-frame, pgtk-dnd-default-test-function)
(pgtk-dnd-current-type, pgtk-dnd-forget-drop)
(pgtk-dnd-maybe-call-test-function, pgtk-dnd-save-state)
(pgtk-dnd-handle-moz-url, pgtk-dnd-insert-utf8-text)
(pgtk-dnd-insert-utf16-text, pgtk-dnd-insert-ctext)
(pgtk-dnd-handle-uri-list, pgtk-dnd-handle-file-name)
(pgtk-dnd-choose-type, pgtk-dnd-drop-data)
(pgtk-dnd-handle-drag-n-drop-event, pgtk-update-drop-status)
(pgtk-drop-finish, pgtk-dnd-handle-gdk, pgtk-dnd): New variables
and functions and library.

* lisp/term/pgtk-win.el (special-event-map): Load
`drag-n-drop-event'.
(after-make-frame-functions): Register DND after make frame
functions.

* src/emacs.c (main): Stop calling empty init_pgtkterm function.

* src/pgtkselect.c (Fpgtk_register_dnd_targets, Fpgtk_drop_finish)
(Fpgtk_update_drop_status): New functions.
(syms_of_pgtkselect): Register new functions.
* src/pgtkterm.c (struct event_queue_t): Fix coding style of
definition.
(symbol_to_drag_action, drag_action_to_symbol)
(pgtk_update_drop_status, pgtk_finish_drop): New functions.
(drag_data_received): Delete function.
(pgtk_set_event_handler): Register for DND correctly.
(syms_of_pgtkterm): New defsyms for DND types.
(init_pgtkterm): Delete function.

* src/pgtkterm.h: Update prototypes, fix prototype coding style.

* src/frame.c (delete_frame): Clear selections and swallow
special events.

* src/keyboard.c (kbd_buffer_get_event, process_special_events):
Also handle selection events on PGTK.

* src/keyboard.h (union buffered_input_event): Include selection
events on PGTK.

* src/pgtkselect.c (symbol_to_gtk_clipboard, LOCAL_SELECTION):
New functions and macros.
(selection_type_to_quarks, get_func, clear_func): Delete
functions.
(pgtk_selection_init, pgtk_selection_lost):
(pgtk_selection_usable): New functions.
(Fpgtk_own_selection_internal, Fpgtk_disown_selection_internal)
(Fpgtk_selection_exists_p, Fpgtk_selection_owner_p)
(Fpgtk_get_selection_internal): Complete rewrite.
(syms_of_pgtkselect): Update defsyms and add more hooks.

* src/pgtkselect.h: Delete file.

* src/pgtkterm.c (evq_enqueue): Set last user time based on the
event.
(pgtk_any_window_to_frame, button_event): Fix coding style.
(pgtk_set_event_handler): Add selection events.
(pgtk_find_selection_owner, pgtk_selection_event): New
functions.
(pgtk_term_init): Remove call to `pgtk_selection_init'.

* src/pgtkterm.h (struct pgtk_display_info): New field
`display'.
(enum selection_input_event): New struct.  New macros for
accessing its fields.

* src/pgtkfns.c (pgtk_explicitly_set_name, pgtk_set_tab_bar_lines)
(pgtk_change_tab_bar_height, pgtk_set_child_frame_border_width)
(pgtk_set_internal_border_width, pgtk_set_cursor_type)
(pgtk_set_mouse_color, pgtk_set_override_redirect, xg_set_icon)
(pgtk_frame_parm_handlers, Fpgtk_set_monitor_scale_factor)
(pgtk_set_scroll_bar_default_width, pgtk_get_focus_frame)
(pgtk_hide_tip, Fx_show_tip, Fx_hide_tip, frame_geometry)
(syms_of_pgtkfns): Clean up coding style and delete incorrect
comments that mostly duplicate what is in xfns.c, and fix
comment coding style.  Also rename functions from `x_' to
`pgtk_'.

* src/pgtkterm.c (pgtk_setup_relief_colors): Fix relief caching
with new flag.
(pgtk_draw_relief_rect, flip_cr_context, pgtk_wait_for_map_event)
(pgtk_make_frame_visible, pgtk_make_frame_invisible)
(pgtk_set_parent_frame, pgtk_draw_glyph_string_foreground)
(pgtk_draw_composite_glyph_string_foreground)
(pgtk_draw_glyphless_glyph_string_foreground)
(pgtk_set_clip_rectangles, pgtk_draw_glyph_string_bg_rect)
(pgtk_draw_image_foreground, pgtk_draw_image_glyph_string)
(pgtk_draw_stretch_glyph_string, pgtk_draw_glyph_string)
(pgtk_copy_bits, pgtk_bitmap_icon, pgtk_define_fringe_bitmap)
(pgtk_show_hourglass, pgtk_flash, pgtk_send_scroll_bar_event)
(pgtk_free_pixmap, set_opacity_recursively, frame_highlight)
(frame_unhighlight, pgtk_toggle_invisible_pointer)
(pgtk_create_terminal, pgtk_window_is_of_frame_recursive)
(pgtk_window_is_of_frame, pgtk_any_window_to_frame)
(pgtk_handle_draw, size_allocate, pgtk_enqueue_string)
(key_press_event, motion_notify_event): Fix coding style and
some minor bugs.

* src/pgtkterm.h (struct pgtk_output): New field for tracking
relief color status, update prototypes.

* src/gtkutil.c (xg_set_geometry):
(xg_frame_set_char_size):
(x_wm_set_size_hint): Rename to `xg_wm_set_size_hint'.  All
callers changed.
* src/gtkutil.h: Update prototypes.
* src/pgtkfns.c (unwind_create_frame):
(Fx_create_frame):
(compute_tip_xy):
* src/pgtkterm.c (x_free_frame_resources):
(x_destroy_window):
(x_calc_absolute_position):
(x_set_offset):
(pgtk_set_window_size):
(x_display_pixel_height):
(x_display_pixel_width):
(x_set_parent_frame): Rename `x_foo' functions to `pgtk_foo'.
Get rid of some copy-pasted code from various places.
(pgtk_create_terminal): Clean up coding style.
* src/pgtkterm.h: Update prototypes.

* src/pgtkfns.c (x_set_foreground_color, x_set_background_color)
(x_set_border_color, x_set_cursor_color, x_set_title)
(x_set_menu_bar_lines, x_set_tab_bar_lines, x_set_tool_bar_lines)
(x_set_child_frame_border_width, x_set_internal_border_width)
(x_set_icon_type, x_set_icon_name, x_set_cursor_type)
(x_set_mouse_color, x_set_undecorated, x_set_skip_taskbar)
(x_set_override_redirect, pgtk_frame_parm_handlers)
(Fx_create_frame): Rename most `x_' functions to `pgtk_' ones.
All callers changed.
* src/pgtkmenu.c (Fx_menu_bar_open_internal): Remove duplicate
doc string definition.
* src/pgtkterm.c (x_set_offset, pgtk_iconify_frame)
(x_set_parent_frame, x_set_no_focus_on_map, x_set_no_accept_focus)
(x_set_z_group, x_set_cursor_gc, x_set_mouse_face_gc)
(x_set_mode_line_face_gc, x_set_glyph_string_gc)
(x_set_glyph_string_clipping, x_set_glyph_string_clipping_exactly)
(x_setup_relief_color, x_setup_relief_colors)
(x_set_clip_rectangles, x_draw_relief_rect, x_draw_box_rect)
(x_draw_glyph_string_box, x_draw_image_relief)
(x_draw_image_foreground, x_draw_stretch_glyph_string)
(pgtk_draw_glyph_string, x_set_toolkit_scroll_bar_thumb)
(x_set_toolkit_horizontal_scroll_bar_thumb)
(pgtk_set_vertical_scroll_bar, pgtk_set_horizontal_scroll_bar)
(x_set_frame_alpha, frame_highlight, frame_unhighlight)
(pgtk_create_terminal, map_event): Rename most `x_' functions to
`pgtk_' ones.  All callers changed.
* src/pgtkterm.h: Update prototypes.

* src/pgtkterm.c (STORE_KEYSYM_FOR_DEBUG): Delete macro.
(x_find_modifier_meanings): Delete function.
(get_modifier_values, pgtk_gtk_to_emacs_modifiers)
(pgtk_emacs_to_gtk_modifiers): Use GDK's own modifier mask
constants instead of detecting our own from the keymap.  This
does mean a specific "meta" key will no longer be detected on X
Windows, but that interface doesn't exist on Wayland, and X
users should use the X port anyway.
(key_press_event): Avoid decoding input text.
(pgtk_term_init): Stop computing modifiers.
(syms_of_pgtkterm): Delete obsolete comment.
* src/pgtkterm.h (struct pgtk_display_info): Delete modifier
masks.

* lisp/frame.el (device-class): Add new function.
* lisp/term/pgtk-win.el (pgtk-device-class): New function.
* src/pgtkterm.c (pgtk_device_added_or_removal_cb)
(pgtk_seat_added_cb, pgtk_seat_removed_cb)
(pgtk_enumerate_devices)
(pgtk_free_devices, pgtk_regenerate_devices)
(pgtk_get_device_for_event): New functions.
(mark_pgtkterm): Mark device data.
(pgtk_delete_terminal): Delete device data.
(pgtk_handle_event, key_press_event, note_mouse_movement)
(construct_mouse_click, button_event, scroll_event)
(drag_data_received): Set device correctly.
(pgtk_term_init): Initialize device data and seat tracking.
(pgtk_delete_display): Delete device data.
* src/pgtkterm.h (struct pgtk_device_t): New struct.
(struct pgtk_display_info): New field `devices'.  Delete lots of
unused macros and reformat comments.

* src/pgtkfns.c (Fx_open_connection):
* src/pgtkselect.c (nxatoms_of_pgtkselect):
* src/pgtkselect.h:
* src/pgtkterm.h: Delete `nxatoms_of_pgtkselect'.