fix: make popup rendering deterministic

popup_layout.c

@@ -0,0 +1,29 @@
+#include "dat.h"
+#include "popup_layout.h"
+
+int
+popupcells(Rune *r, int n)
+{
+	int i, w;
+
+	w = 0;
+	for(i = 0; i < n; i++)
+		if(r[i] != 0xfe0e && r[i] != 0xfe0f)
+			w++;
+	return w;
+}
+
+void
+popupposition(Caret *caret, int pointerx, int pointery, int screenw,
+	int screenh, int w, int h, int *x, int *y)
+{
+	if(caret->valid){
+		*x = caret->x;
+		*y = caret->y + max(caret->h, 0);
+	}else{
+		*x = pointerx + 10;
+		*y = pointery + 10;
+	}
+	*x = max(0, min(*x, screenw - w));
+	*y = max(0, min(*y, screenh - h));
+}