(extend_face_to_end_of_line): Always add space glyph to
empty row. Fixes memory corruption revealed by 2006-03-02 change. (display_tool_bar_line): Skip empty tool-bar line if HEIGHT < 0. (tool_bar_lines_needed): Fix tool-bar display in case the tool-bar width is exactly the same as the window width. Don't count a final empty tool-bar line (pass HEIGHT = -1 to display_tool_bar_line).
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