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	Fix an incorrect test which was always true (oupper is always < olower),
from Yusuke ENDOH.
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							@@ -454,7 +454,7 @@ tty_redraw_region(struct tty *tty, const struct tty_ctx *ctx)
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	 * without this, the entire pane ends up being redrawn many times which
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	 * can be much more data.
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	 */
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	if (ctx->orupper - ctx->orlower >= screen_size_y(s) / 2) {
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	if (ctx->orlower - ctx->orupper >= screen_size_y(s) / 2) {
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		wp->flags |= PANE_REDRAW;
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		return;
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	}
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