IDML Filter: Merge tags that differ by kerning method

There are the following kerning methods available:

Optical - when the kerning is automatically defined per character in the range
Metrics - when the KerningMethod attribute is absent at all (equals to 0 in the UI)
None - when the kerning value is set 0
Manual - when there is a manually set value, other than 0

And this is how they look like in the UI:

And in the corresponding paragraph:

        <ParagraphStyleRange AppliedParagraphStyle="ParagraphStyle/$ID/NormalParagraphStyle">
            <CharacterStyleRange AppliedCharacterStyle="CharacterStyle/$ID/[No character style]" KerningMethod="$ID/Optical">
                <Content>KerningMethodOptical</Content>
                <Br/>
            </CharacterStyleRange>
            <CharacterStyleRange AppliedCharacterStyle="CharacterStyle/$ID/[No character style]">
                <Content>KerningMethodMetrics</Content>
            </CharacterStyleRange>
            <CharacterStyleRange AppliedCharacterStyle="CharacterStyle/$ID/[No character style]" KerningMethod="$ID/Optical">
                <Br/>
            </CharacterStyleRange>
            <CharacterStyleRange AppliedCharacterStyle="CharacterStyle/$ID/[No character style]" KerningMethod="$ID/None" KerningValue="0">
                <Content>KerningMethod0</Content>
            </CharacterStyleRange>
            <CharacterStyleRange AppliedCharacterStyle="CharacterStyle/$ID/[No character style]" KerningMethod="$ID/Optical">
                <Br/>
            </CharacterStyleRange>
            <CharacterStyleRange AppliedCharacterStyle="CharacterStyle/$ID/[No character style]">
                <Content>Kerning</Content>
            </CharacterStyleRange>
            <CharacterStyleRange AppliedCharacterStyle="CharacterStyle/$ID/[No character style]" KerningMethod="$ID/Manual" KerningValue="5">
                <Content>5</Content>
            </CharacterStyleRange>
            <CharacterStyleRange AppliedCharacterStyle="CharacterStyle/$ID/[No character style]" KerningMethod="$ID/Manual" KerningValue="10">
                <Content>10</Content>
            </CharacterStyleRange>
        </ParagraphStyleRange>

For more details please refer to the attached file in the IDML format.

They probably have to be merged under the ignoreCharacterKerning parameter set to true.

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