Remove all references to gui_current_drag_type outside of gui.c which are not related to routing DataSaveAck messages.
Update button bar drag code so that it uses ro_mouse.
Add Pointer Entering Window events to wimp_event module and add handlers to all modules requiring mouse tracking.
Updated: Treeview, URL Complete, History and GUI Window.
Delete all handling for Pointer Entering/Leaving from ro_gui.
Add ro_mouse module to process mouse events during drags and on null polls.
Implement support in ro_mouse for tracking the mouse during drags and passing on DragEnd events.
Remove ro_gui_drag_end() and update all of its clients so that they use ro_mouse.
Remove the unused ro_gui_window_frame_resize_end().
Termination of save drags with Escape is unimplemented, but appears broken anyway.
The use of gui_drag_type is still required to handle Message_DatasaveAck processing.
Mouse tracking is still handled via gui.c.
Added content interface for search.
Removed bw->cur_search search context. Desktop layer now does nothing
except pass search requests from front end onto the bw's current_content
via the content interface.
Search API reduced to a pair of functions at each level:
{desktop|content|html|textplain}_search
and
{desktop|content|html|textplain}_search_clear
Updated front ends to use simplified search API. Only tested GTK and RO builds.
These confine the search stuff to render/. However search still uses struct
selection. The handling for which is still spread over desktop/ and render/.
Also the render/search code itself still fiddles inside html and textplain
privates.
Keypresses now go via content interface.
Contents don't shove the selection object into browser windows any more.
Contents report selection existence by sending message.
HTML content keeps track of where selections in it exist.
Contents report whether they have input focus via caret setting msg.
Caret can be hidden (can still input/paste) or removed.
Consolidate textarea selection handling.
Make textarea report its selection status changes to client.
Various textarea fixes.
Changed how we decide when to clear selections, and give focus.
