Fixed RichTextPane somewhat.

Switched to BreakIterator.

PostWindow.java

@@ -32,6 +32,8 @@ import java.time.ZonedDateTime;
 import java.time.format.DateTimeFormatter;
 import java.io.IOException;
 import cafe.biskuteri.hinoki.Tree;
+import java.text.BreakIterator;
+import java.util.Locale;
 
 
 class
@@ -373,8 +375,19 @@ implements ActionListener {
 			}
 			if (node.key.equals("text"))
 			{
-				for (String word: node.value.split(" "))
-					b = b.text(word).spacer(" ");
+				BreakIterator it = BreakIterator.getWordInstance(Locale.ROOT);
+				String text = node.value;
+				it.setText(text);
+				int start = it.first(), end = it.next();
+				while (end != BreakIterator.DONE)
+				{
+					String word = text.substring(start, end);
+					char c = word.isEmpty() ? ' ' : word.charAt(0);
+					boolean w = Character.isWhitespace(c);
+					b = w ? b.spacer(word) : b.text(word);
+					start = end;
+					end = it.next();
+				}
 			}
 			if (node.key.equals("emoji"))
 			{

RichTextPane.java

@@ -53,13 +53,12 @@ RichTextPane extends JComponent {
 	public static List<Segment>
 	layout(List<Segment> text, FontMetrics fm, int width)
 	{
-		if (width < fm.getMaxAdvance()) return new LinkedList<>();
-
 		List<Segment> copy = new LinkedList<>();
 		for (Segment segment: text) copy.add(segment.clone());
 		text = copy;
 		ListIterator<Segment> cursor = text.listIterator();
-		int dy = fm.getHeight(), x = 0, y = dy;
+		int x = 0, y = fm.getAscent();
+		int dy = fm.getHeight();
 		while (cursor.hasNext())
 		{
 			Segment curr = cursor.next();
@@ -82,8 +81,10 @@ RichTextPane extends JComponent {
 				dx = 0;
 			}
 
-			// If can readily fit, just do so.
-			if (x + dx < width || curr.spacer) {
+			boolean fits = x + dx < width;
+			
+			if (fits || curr.spacer)
+			{
 				curr.x = x;
 				curr.y = y;
 				x += dx;
@@ -94,47 +95,68 @@ RichTextPane extends JComponent {
 				continue;
 			}
 
-			// If image, or text that isn't long, just break.
-			if (curr.image != null || dx < width / 3) {
+			boolean tooLong = dx > width;
+			boolean canFitChar = width >= fm.getMaxAdvance();
+			boolean splittable = curr.image == null;
+			/*
+			* A bit of redundancy in my conditions, but the point is
+			* to exactly express the triggers in my mental model.
+			* The conditions should read more like English.
+			*/
+
+			if (!tooLong || (tooLong && !splittable))
+			{
 				curr.x = 0;
 				curr.y = y += dy;
 				x = dx;
 				continue;
 			}
 
-			// Greedily split string to fit into line.
-			int offset = splitForFit(curr.text, fm, width - x);
-			if (offset == 0) {
-				cursor.add(curr); cursor.previous();
-				y += dy;
-				x = dx;
-				continue;
+			assert tooLong && splittable;
+
+			String s = curr.text;
+			int splitOffset;
+			for (splitOffset = 0; splitOffset < s.length(); ++splitOffset)
+			{
+				String substring = s.substring(0, splitOffset + 1);
+				if (fm.stringWidth(substring) > width) break;
 			}
-			Segment next = new Segment();
-			next.text = curr.text.substring(offset);
-			next.link = curr.link;
-			cursor.add(next); cursor.previous();
-			curr.text = curr.text.substring(0, offset);
-			curr.x = x;
-			curr.y = y;
+			if (splitOffset == 0) splitOffset = 1;
+			/*
+			* I force a split even if our width supports no characters.
+			* Because if I don't split, the only alternatives to infinitely
+			* looping downwards is to emplace this segment or ignore it.
+			*/
+			Segment fitted = new Segment();
+			fitted.text = s.substring(0, splitOffset);
+			fitted.link = curr.link;
+			fitted.x = x;
+			fitted.y = y;
+			cursor.add(fitted);
+			curr.text = s.substring(splitOffset);
 			y += dy;
 			x = 0;
+			cursor.add(curr); cursor.previous();
+			/*
+			* I had to use a stack and return a new list because,
+			* splitting can turn a long segment into several spread
+			* over different lines. Here curr becomes the "after-split"
+			* and I push it back to the stack.
+			*
+			* If #layout wasn't a separate method, but rather only for
+			* graphical painting. Then I don't need a stack nor return
+			* a new list. I iterate over the given one, filling the
+			* nodes' geometric information, if a split occurs I save the
+			* "after-split" in a variable, which in the next iteration
+			* I use as curr instead of list.next(). The caller doesn't
+			* need to know the geometry of these intermediate segments.
+			*/
 			continue;
 		}
+
 		return text;
 	}
 
-//	 -	-%-	 -
-
-	private static int
-	splitForFit(String s, FontMetrics fm, int width)
-	{
-		int max = 0;
-		for (int o = 1; o < s.length(); max = o++)
-			if (fm.stringWidth(s.substring(0, o)) > width) break;
-		return max;
-	}
-
 //	---%-@-%---
 
 	public static class