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If I use tabs instead of spaces to indent my java sources (I have a code generation tool that does this and can't be configured not to) the file cannot be parsed by the IDE. (The explorer displays an error icon instead of a breakdown of the class's methods, etc.) Further to this, if I have 'expand tabs to spaces' switched on in the java indentation engine options, pre-existing tabs are NOT converted to spaces on save. I am using the beta version of the java sources module (the one with JDK1.4 support, but set to JDK1.3 mode).
This is probably another manifestation of issue #18584. 'Expand tabs to spaces' option is used when you change the document. Ie. you type 'Tab' or you use indentation engine to reformat text for example by selection block and pressing Tab or Shift-Tab to change indentation of the block. *** This issue has been marked as a duplicate of 18584 ***
Resolved for 3.3.x or earlier, no new info since then -> closing.
Resolved for 3.4.x or earlier, no new info since then -> closing.