HTML API: Make "reset insertion mode appropriately" algorithm private.

The algorithm is described and referred to in the specification as
"reset the insertion mode appropriately." This patch renames it to
more accurately reflect the specification, and it turns the public
method private. As an internal algorithm from the HTML specification
it should not be open to extension.

Developed in #7194
Discussed in https://core.trac.wordpress.org/ticket/61549

Follow-up to [28656].
Props jonsurrell.
See #61549.


git-svn-id: https://develop.svn.wordpress.org/trunk@58898 602fd350-edb4-49c9-b593-d223f7449a82

Author: dmsnell

src/wp-includes/html-api/class-wp-html-processor.php

@@ -1501,7 +1501,7 @@ private function step_in_head(): bool {
 				$this->state->stack_of_open_elements->pop_until( 'TEMPLATE' );
 				$this->state->active_formatting_elements->clear_up_to_last_marker();
 				array_pop( $this->state->stack_of_template_insertion_modes );
-				$this->reset_insertion_mode();
+				$this->reset_insertion_mode_appropriately();
 				return true;
 		}
 
@@ -2955,7 +2955,7 @@ private function step_in_table(): bool {
 				}
 
 				$this->state->stack_of_open_elements->pop_until( 'TABLE' );
-				$this->reset_insertion_mode();
+				$this->reset_insertion_mode_appropriately();
 				return $this->step( self::REPROCESS_CURRENT_NODE );
 
 			/*
@@ -2968,7 +2968,7 @@ private function step_in_table(): bool {
 				}
 
 				$this->state->stack_of_open_elements->pop_until( 'TABLE' );
-				$this->reset_insertion_mode();
+				$this->reset_insertion_mode_appropriately();
 				return true;
 
 			/*
@@ -3729,7 +3729,7 @@ private function step_in_select(): bool {
 					return $this->step();
 				}
 				$this->state->stack_of_open_elements->pop_until( 'SELECT' );
-				$this->reset_insertion_mode();
+				$this->reset_insertion_mode_appropriately();
 				return true;
 
 			/*
@@ -3745,7 +3745,7 @@ private function step_in_select(): bool {
 					return $this->step();
 				}
 				$this->state->stack_of_open_elements->pop_until( 'SELECT' );
-				$this->reset_insertion_mode();
+				$this->reset_insertion_mode_appropriately();
 				return $this->step( self::REPROCESS_CURRENT_NODE );
 
 			/*
@@ -3800,7 +3800,7 @@ private function step_in_select_in_table(): bool {
 			case '+TH':
 				// @todo Indicate a parse error once it's possible.
 				$this->state->stack_of_open_elements->pop_until( 'SELECT' );
-				$this->reset_insertion_mode();
+				$this->reset_insertion_mode_appropriately();
 				return $this->step( self::REPROCESS_CURRENT_NODE );
 
 			/*
@@ -3819,7 +3819,7 @@ private function step_in_select_in_table(): bool {
 					return $this->step();
 				}
 				$this->state->stack_of_open_elements->pop_until( 'SELECT' );
-				$this->reset_insertion_mode();
+				$this->reset_insertion_mode_appropriately();
 				return $this->step( self::REPROCESS_CURRENT_NODE );
 		}
 
@@ -3954,7 +3954,7 @@ private function step_in_template(): bool {
 		$this->state->stack_of_open_elements->pop_until( 'TEMPLATE' );
 		$this->state->active_formatting_elements->clear_up_to_last_marker();
 		array_pop( $this->state->stack_of_template_insertion_modes );
-		$this->reset_insertion_mode();
+		$this->reset_insertion_mode_appropriately();
 		return $this->step( self::REPROCESS_CURRENT_NODE );
 	}
 
@@ -5100,7 +5100,7 @@ private function reconstruct_active_formatting_elements(): bool {
 	 *
 	 * @see https://html.spec.whatwg.org/multipage/parsing.html#reset-the-insertion-mode-appropriately
 	 */
-	public function reset_insertion_mode(): void {
+	private function reset_insertion_mode_appropriately(): void {
 		// Set the first node.
 		$first_node = null;
 		foreach ( $this->state->stack_of_open_elements->walk_down() as $first_node ) {