Share gitRefs when reloading after changing sort criterias

[gerhardol]

Part of #9888 (that is follow up to #9864)

Leaves the "double side panel init" to later.
#9884 is already approved but have a refresh issue that I do not know how to solve in a good way and therefore separate most of the changes.

Proposed changes

• Changing filters required 3 separate getRefs() calls (so it could be slower than refreshing the complete grid).
• Share getRefs() after loading the grid when filters are applied (normally, this is not needed though if the structure is not rebuilt).

Getting refs can take >10s in large repos and should only not be done 3 times when only one is needed.
Future: This could possibly be cached too, requiring an "external" refresh to reread the cache.

Screenshots

For changing sort criteria

Before

After

Test methodology

Manual

Merge strategy

I agree that the maintainer squash merge this PR (if the commit message is clear).

---

✒️ I contribute this code under The Developer Certificate of Origin.

[mstv]

refs rather is getRefs.