DocBlocks for filters inside a conditional expression are not imported

DocBlocks outside a conditional are not imported if there are other filters (with DocBlocks) within the conditional.

Example 1

In this example DocBlock 2 is not imported for the filter in_conditional_expression

/**
 * DocBlock 1
 */
function test_docblocks() {
	/**
	 * DocBlock 2
	 */
	if ( apply_filters( 'in_conditional_expression', true ) ) {
		/**
		 * DocBlock 3
		 */
		$value = apply_filters( 'in_conditional', true );
	}
}

Example 2

In this example the (wrong) DocBlock 2 is imported for the filter 'in_conditional`.

/**
 * DocBlock 1
 */
function test_docblocks() {
	/**
	 * DocBlock 2
	 */
	if ( apply_filters( 'in_conditional_expression', true ) ) {

		$value = apply_filters( 'in_conditional', true );
	}
}

The wp_save_post_revision_check_for_changes filter doesn't get its DocBlock imported because of this bug.

See this filter in trac

Start by reproducing the two PHP examples and tracing how apply_filters calls inside conditional expressions are associated with DocBlocks. Compare the parser's result for both examples with the expected filter documentation, including wp_save_post_revision_check_for_changes. Done means DocBlock 2 is assigned to in_conditional_expression and the correct DocBlock is assigned to in_conditional.