[kde] [Bug 509891] New: Qt6 build compatibility issue: Q_FOREACH macro still used

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https://bugs.kde.org/show_bug.cgi?id=509891

            Bug ID: 509891
           Summary: Qt6 build compatibility issue: Q_FOREACH macro still
                    used
    Classification: I don't know
           Product: kde
      Version First unspecified
       Reported In:
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: jshand2013 at gmail.com
  Target Milestone: ---

Operating System: openSUSE Tumbleweed 20250923
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.18.0
Qt Version: 6.9.2
Kernel Version: 6.16.8-1-default (64-bit)
Graphics Platform: Wayland
Processors: 12 × Intel® Core™ 7 150U
Memory: 16 GiB of RAM (15.3 GiB usable)
Graphics Processor: Intel® Graphics
Manufacturer: Dell Inc.
Product Name: Inspiron 16 5640

Qt6 build compatibility issue: Q_FOREACH macro still used

**Severity:** Medium  
**Area:** Server / SearchManager  

## Description
Code targets Qt6 (`find_package(Qt6...)`), but still uses `Q_FOREACH` macro in
`SearchManager`. This macro was removed in Qt6; compilation may rely on compat
headers or fail on some setups.

## Evidence
/mnt/data/akonadi_extracted/akonadi/src/server/search/searchmanager.cpp lines
96–101:

```
  96|      * and causes crash on Akonadi shutdown (below main). Keeping the
plugins
  97|      * loaded is not really a big issue as this is only invoked on server
shutdown
  98|      * anyway, so we are not leaking any memory.
  99|     Q_FOREACH (QPluginLoader *loader, mPluginLoaders) {
 100|         loader->unload();
 101|         delete loader;
```

## Steps to Reproduce
1. Build Akonadi against a strict Qt6 environment without Qt5Compat headers.
2. Compilation errors occur at `Q_FOREACH` usage.

## Expected Behavior
Code should compile cleanly under Qt6 without deprecated Qt5 macros.

## Actual Behavior
`Q_FOREACH` persists in codebase.

## Suggested Fix / Next Steps
- Replace `Q_FOREACH` with C++11 range-based for loop: `for (auto *loader :
mPluginLoaders) { ... }`.
- Remove any remaining uses of `foreach`/`Q_FOREACH` macros.

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