Fix:Strings are concatenated when completing code for % directives

[xterao]

We have fixed an issue where, when performing code completion for the % directive, the candidate string was appended to the end of the input text. Now, the text up to % will be replaced by the candidate string.

[Copilot]

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src/main/kotlin/org/domaframework/doma/intellij/common/sql/directive/PercentDirectiveHandler.kt:36

• [nitpick] The variable name 'beforeTextChars' may be misleading since it holds the count of previous leaf nodes rather than their character content. Consider renaming it to 'prevLeafCount' for improved clarity.

val beforeTextChars =

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src/main/kotlin/org/domaframework/doma/intellij/common/sql/directive/PercentDirectiveHandler.kt:36

• Counting PSI leaf nodes to determine the number of characters assumes that each leaf node represents one character, which may not be true. Consider summing the lengths of each leaf's text to accurately calculate the start offset for replacement.

val beforeTextChars = this.element.prevLeafs.takeWhile { prev -> prev.text != "%" }.toList().size

[xterao]

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Counting PSI leaf nodes to determine the number of characters assumes that each leaf node represents one character, which
may not be true. Consider summing the lengths of each leaf's text to accurately calculate the start offset for replacement.

In this directive's code completion, it is assumed that the preceding string is retrieved as individual characters.