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A screen can be one cell wide; don't crash if that is the case.
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@ -427,8 +427,8 @@ screen_write_initctx(
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return;
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/* Save the last cell on the screen. */
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gc = NULL;
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for (xx = 1; xx < screen_size_x(s); xx++) {
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gc = &grid_default_cell;
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for (xx = 1; xx <= screen_size_x(s); xx++) {
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gc = grid_view_peek_cell(gd, screen_size_x(s) - xx, s->cy);
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if (!(gc->flags & GRID_FLAG_PADDING))
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break;
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