(remember_mouse_glyph): New function.
(w32_mouse_position): Use it. (note_mouse_movement): If the mouse moved off the glyph, remember its new position. Sync with xterm.c: (notice_overwritten_cursor): Renamed from note_overwritten_text_cursor. Rewritten to take glyph widths into account. (x_y_to_hpos_vpos): Add parameter BUFFER_ONLY_P. (fast_find_string_pos): New function. (fast_find_position): Return the correct vpos. Add parameter STOP. In the final row, stop before glyphs having STOP as object. Don't consider glyphs that are not from a buffer. (fast_find_position) : Add a presumably more correct version for after 21.1. (expose_window_tree, expose_frame): Don't compute intersections here. (expose_window): Do it here instead. (expose_window_tree, expose_window, expose_line): Return 1 when overwriting mouse-face. (expose_window): If W is the window currently being updated, mark the frame garbaged. (expose_frame): If mouse-face was overwritten, redo it. (x_use_underline_position_properties): New variable. (syms_of_xterm): DEFVAR_BOOL it. (x_draw_glyph_string): Add comment to use it in future. (x_draw_glyph_string): Restore clipping after drawing box. Fix a computation of the underline position. (w32_get_glyph_string_clip_rect): Minor cleanup. (x_fill_stretch_glyph_string): Remove an assertion. (x_produce_glyphs): Don't convert multibyte characters to unibyte characters in unibyte buffers. (cursor_in_mouse_face_p): New function. (x_draw_stretch_glyph_string): Use it to choose a different GC when drawing a cursor within highlighted text. Don't draw background again if it has already been drawn. (x_draw_glyph_string_box): Don't draw a full-width box just because the glyph row's full_width_p flag is set. (x_draw_glyphs): Fix computation of rightmost x for full-width rows. (x_dump_glyph_string): Put in #if GLYPH_DEBUG. (w32_draw_relief_rect): Extend left shadow to the bottom and left; change bottom shadow accordingly. Some cleanup. (x_update_window_end): Handle overwritten mouse face also for tool bar windows. (show_mouse_face): Set the glyph row's mouse_face_p flag also when DRAW is DRAW_IMAGE_RAISED. (clear_mouse_face): Return 1 if text with mouse face was actually redrawn. Make the function static. Reset dpyinfo->mouse_face_overlay otherwise note_mouse_highlight might optimize away highlighting if we pass over that same overlay again. (note_mouse_highlight): Call mouse_face_overlay_overlaps to detect a case where we have to highlight a different region despite not having left the currently highlighted region. Set mouse_face_overlay in the x_display_info. Avoid changing the mouse pointer shape when show_mouse_face has already done it, or there is no need. Handle mouse-face and help-echo in strings. (glyph_rect): New function. (w32_mouse_position): Use it to raise the threshold for mouse movement event generation. (w32_initialize_display_info): Initialize the x_display_info's mouse_face_overlay. (w32_set_vertical_scroll_bar): Don't clear a zero height or width area. (w32_set_vertical_scroll_bar, x_scroll_bar_create): Don't configure a widget to zero height.
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