in kinetis IDE how do add column marks such as in the picture below
this is from an different IDE
there is code collapsing/folding (see Eclipse Folding | MCU on Eclipse ), but not with such lines.
What you are asking for is discussed in Vertical line between matching curly braces for java in eclipse - Stack Overflow , and it mentions the Plugin IntentGuide (IndentGuide ) which does what you wants, but I have not tried it.
I hope this helps,
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