mattcasters opened a new pull request, #7531:
URL: https://github.com/apache/hop/pull/7531

   ## What
   
   Fixes `org.eclipse.jgit.errors.MissingObjectException` in the Git 
Perspective when switching Hop projects (or explorer roots) that map to 
different local git repositories.
   
   ## Root cause
   
   The Git Perspective is a long-lived singleton. On project switch it opened 
the new repository and then called `updateGui()` while the history table still 
held `RevCommit` selection from the **previous** repo. 
`isCommitInCurrentBranch` re-parsed those ids against the newly opened object 
database → `Missing unknown <other-project-SHA>`.
   
   This is a 2.18 Git Perspective lifecycle bug, not a general JGit inability 
to read commit-graph / multi-pack-index / bitmaps. See the analysis on #7520.
   
   ## Changes
   
   - **A:** Clear ref/history/file UI state first on refresh; rebuild for the 
current repo; call `updateGui()` last.
   - **B:** Close the previous `UIGit` repository on `rootChanged` (null-safe 
`closeRepo()`).
   - **C:** Harden branch membership check: `objectDatabase.has(id)` / quiet 
`MissingObjectException` for foreign ids.
   - Small headless JGit unit test for the branch-check helper (two temp repos; 
no native git, no SWT).
   
   ## How was this tested?
   
   - `./mvnw -pl plugins/misc/git -am test -Dtest=GitPerspectiveBranchCheckTest 
-Dsurefire.failIfNoSpecifiedTests=false`
   - Compile of the git plugin module
   
   ## Related
   
   Fixes #7520


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