(display_tool_bar_line): Skip glyphs which are too big
to ever fit the tool-bar, (MAX_FRAME_TOOL_BAR_HEIGHT): New macro. (tool_bar_lines_needed): Use unused mode-line row as temp_row. (redisplay_tool_bar): Only clear desired matrix if we actually change the tool-bar window height. Only try to make the tool-bar window bigger if there is actually room for it.
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