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* imgui: Clamp mouse y-coordinate in multi-line click/drag to text bounds In single-line mode, click and drag already clamped y to the line's y-coordinate so the cursor would continue to follow the x-position when the mouse went off the top or bottom of the text. Multi-line mode did not clamp, so stb_text_locate_coord() would return 0 (above) or n (below), snapping the cursor to the very start or end of text and ignoring the x-coordinate entirely. Now both modes walk the row layout to compute the top of the first row (y_min) and bottom of the last row (y_max, minus half a line height to add tolerance for rounding), then clamp y to that range before passing it to stb_text_locate_coord(). This means dragging or clicking above the text now places the cursor on the first line at the x-coordinate, and dragging/clicking below places it on the last line at the x-coordinate, matching the single-line precedent. * Fix issue that cursor cannot be placed at the last empty line