Improve interactions between wroteAnythingSignificant and whitespace requests.

Mainly, make all whitespace requests into no-ops if we haven't written anything significant yet. This lets us remove various existing special cases.

But also, start setting `wroteAnythingSignificant` in some locations where we write to `output` without using `writeToken` (which would set `wroteAnythingSignificant` automatically).

PiperOrigin-RevId: 945842813

Author: cpovirk

core/src/main/java/com/google/googlejavaformat/java/javadoc/JavadocWriter.java

@@ -145,9 +145,7 @@ void writeFooterJavadocTagStart(FooterJavadocTagStart token) {
      */
     postWriteModifiedContinuingListStack.reset();
 
-    if (!wroteAnythingSignificant) {
-      // Javadoc consists solely of tags. This is frowned upon in general but OK for @Overrides.
-    } else if (!continuingFooterTag) {
+    if (!continuingFooterTag) {
       // First footer tag after a body tag.
       requestBlankLine();
     } else {
@@ -234,9 +232,7 @@ void writeListItemOpen(ListItemOpenTag token) {
   }
 
   void writeHeaderOpen(HeaderOpenTag token) {
-    if (wroteAnythingSignificant) {
-      requestBlankLine();
-    }
+    requestBlankLine();
 
     writeToken(token);
   }
@@ -262,29 +258,23 @@ void writeParagraphOpen(Token token) {
   }
 
   void writeBlockquoteOpen(BlockquoteOpenTag token) {
-    if (wroteAnythingSignificant) {
-      requestBlankLine();
-    }
+    requestBlankLine();
 
     writeToken(token);
 
     requestNewline();
   }
 
   void writeBlockquoteClose(BlockquoteCloseTag token) {
-    if (wroteAnythingSignificant) {
-      requestNewline();
-    }
+    requestNewline();
 
     writeToken(token);
 
     requestBlankLine();
   }
 
   void writePreOpen(PreOpenTag token) {
-    if (wroteAnythingSignificant) {
-      requestBlankLine();
-    }
+    requestBlankLine();
 
     writeToken(token);
   }
@@ -304,9 +294,7 @@ void writeCodeClose(CodeCloseTag token) {
   }
 
   void writeTableOpen(TableOpenTag token) {
-    if (wroteAnythingSignificant) {
-      requestBlankLine();
-    }
+    requestBlankLine();
 
     writeToken(token);
   }
@@ -355,7 +343,7 @@ void writeLiteral(Literal token) {
   }
 
   void writeMarkdownFencedCodeBlock(MarkdownFencedCodeBlock token) {
-    if (wroteAnythingSignificant && !atStartOfLine) {
+    if (!atStartOfLine) {
       // A reminder that atStartOfLine is still true after `-␣` because it is a StartOfLineToken.
       requestBlankLine();
     }
@@ -371,11 +359,12 @@ void writeMarkdownFencedCodeBlock(MarkdownFencedCodeBlock token) {
             });
     writeNewline();
     output.append(token.end());
+    wroteAnythingSignificant = true;
     requestBlankLine();
   }
 
   void writeMarkdownTable(MarkdownTable token) {
-    if (wroteAnythingSignificant && !atStartOfLine) {
+    if (!atStartOfLine) {
       requestBlankLine();
     }
     flushWhitespace();
@@ -385,6 +374,7 @@ void writeMarkdownTable(MarkdownTable token) {
       writeNewline(AutoIndent.NO_AUTO_INDENT);
       output.append(line);
     }
+    wroteAnythingSignificant = true;
     requestBlankLine();
   }
 
@@ -419,6 +409,10 @@ private void flushWhitespace() {
       requestNewline();
     }
 
+    if (!wroteAnythingSignificant) {
+      requestedWhitespace = NONE;
+    }
+
     if (classicJavadoc
         && requestedWhitespace == BLANK_LINE
         && (!postWriteModifiedContinuingListStack.isEmpty() || continuingFooterTag)) {
@@ -466,6 +460,7 @@ private void writeToken(Token token) {
       output.append(requestedMoeBeginStripComment.value());
       requestedMoeBeginStripComment = null;
       indentForMoeEndStripComment = innerIndent();
+      wroteAnythingSignificant = true;
       requestNewline();
       writeToken(token);
       return;

core/src/test/java/com/google/googlejavaformat/java/JavadocFormattingTest.java

@@ -284,7 +284,6 @@ class Test {}\
     String expected =
         """
         /**
-         *
          * <!-- moe:begin_intracomment_strip -->
          * Foo.
          * <!-- moe:end_intracomment_strip -->
@@ -1995,11 +1994,9 @@ public void markdownLooseLists() {
         /// - item 2
         class Test {}
         """;
-    // TODO: the line break between items should be preserved, and there should not be a blank line
-    //   before the list.
+    // TODO: the line break between items should be preserved.
     String expected =
         """
-        ///
         /// - item 1
         /// - item 2
         class Test {}
@@ -2259,7 +2256,8 @@ public void tableInHtmlListItem() {
         class Test {}
         """;
     // requestBlankLine() in writeTableOpen() inserts a blank line after <li> before <table> when
-    // inside a list item.
+    // inside a list item. Also, we might prefer to eliminate the blank lines around the table
+    // element and to indent the table contents and close tag at least as far as the open tag.
     String expected =
         """
         /// <ul>
@@ -2286,11 +2284,8 @@ public void tableInsideMarkdownListItemAfterText() {
         ///   </table>
         class Test {}
         """;
-    // requestBlankLine() in writeTableOpen() inserts a blank line after item text before <table>
-    // inside the list item.
     String expected =
         """
-        ///
         /// - item text
         ///
         ///   <table>