Fixes #2034 Call hierarchy, Find Usages and rename widen a server's answer by opening project files that mention the symbol's name and asking again. For JDT LS those files are mostly sources it already analyses, so nearly every incoming-calls request ran a second, slow round before anything was shown. Widening now asks the server which candidates are already in its analysis scope (optional `openidea.workspace.coveredFiles` command, served by the bundled JDT extension using the live source search scope) and only opens the rest; a missing or failing answer keeps the previous behaviour. Covers call hierarchy, references and rename. Hierarchy on a multi-module Maven fixture: median 703 ms → 224 ms, one query round.
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Opening freqtrade (Python, ~770 files) with warm caches, median of 5 runs:
| OpenIDEA | IntelliJ IDEA 2026.2.3 | |
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| Window with the project | 0.9 s | 3.1 s |
| Ready (CPU settled) | 1.1 s | 13.2 s |
| Memory (USS, all processes) | 169 MB | 2011 MB |
| CPU time until ready | 2.4 s | 47.9 s |
| Idle CPU | 4 % of a core | 7 % of a core |
| Quit | 0.3 s | 5.9 s |
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