[WIP][CCR-66] Ref guide for texutal compare revisions

comparing-revisions/IMPLEMENTATION_SUMMARY.md

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+# Comparing Revisions Documentation - Implementation Summary
+
+## ✅ Completed
+
+### New Documentation Files Created (3)
+
+1. **comparison-pane.md** (160 lines)
+   - Location: `/content/en/docs/refguide/modeling/menus/view-menu/comparison-pane.md`
+   - Complete UI reference documentation
+   - All required sections included
+   - Only documents implemented features
+
+2. **comparing-revisions.md** (137 lines)  
+   - Location: `/content/en/docs/refguide/version-control/using-version-control-in-studio-pro/comparing-revisions.md`
+   - Complete workflow guide
+   - Practical scenarios and tips
+   - Clear about limitations
+
+3. **Release Notes** - NOT YET CREATED
+   - Location: `/content/en/docs/releasenotes/studio-pro/11/11.9.md`
+   - ACTION REQUIRED: Create or update this file
+
+### Existing Files Updated (4)
+
+1. **view-menu/_index.md** ✅
+   - Added "Comparison" section after "Changes"
+
+2. **history-dialog.md** ✅
+   - Added "Comparing Revisions" section with explanation
+   - Updated "Read More" section with 2 new links
+
+3. **changes-pane.md** ✅
+   - Added info alert distinguishing Changes vs Comparison
+   - Updated "Read More" section with 2 new links
+
+4. **version-control/_index.md** ✅
+   - Added "Comparing Revisions" section after "Peer Review and Merging"
+
+### Images Organized (2 of 3)
+
+✅ **Created directory:** `/static/attachments/refguide/modeling/menus/view-menu/comparison-pane/`
+
+✅ **Copied images:**
+- `comparison-pane-level1.png` (from ComparisonPane.png)
+- `comparison-pane-level2-3.png` (from ComparisonPaneL2.png)
+
+---
+
+## ⚠️ Remaining Work
+
+### 1. Missing Screenshot (HIGH PRIORITY)
+
+**Required:** `history-right-click-menu.png`
+
+**What it should show:**
+- History Pane with revision list
+- Right-click context menu open on a revision
+- "Compare to current state" option visible
+
+**Where to save:** `/static/attachments/refguide/modeling/menus/view-menu/comparison-pane/history-right-click-menu.png`
+
+**Where it's referenced:**
+- comparison-pane.md (Accessing section) - currently has no image
+- history-dialog.md (Comparing Revisions section) - currently has no image
+
+**Action:** Take screenshot from actual Studio Pro application
+
+### 2. Release Notes Entry (REQUIRED)
+
+**File:** `/content/en/docs/releasenotes/studio-pro/11/11.9.md`
+
+**Action:** Create file if it doesn't exist, or update existing file
+
+**Content to add:**
+```markdown
+#### Comparing Revisions to Current State
+
+Studio Pro now includes a new Comparison Pane that lets you compare any historical revision of your version-controlled app to your current working state. View which documents changed, what elements were added or modified, and which properties differ. The comparison shows three levels of detail: documents, elements, and properties.
+
+To compare a revision, open the History pane, right-click any revision, and select **Compare to current state**. This shows all differences between that revision and your current state, including uncommitted changes.
+
+Phase 2 (planned for Mendix 11.18) will add visual side-by-side document comparison.
+
+For more information, see [Comparison Pane](/refguide/comparison-pane/) and [Comparing Revisions](/refguide/comparing-revisions/).
+```
+
+### 3. Image Review (RECOMMENDED)
+
+**Check if existing images need editing:**
+- `comparison-pane-level1.png` - May show unimplemented "Select revisions" button in toolbar
+- If present, either crop/edit the image or document as acceptable showing spec UI
+
+---
+
+## 📊 Statistics
+
+- **Files created:** 2 documentation files
+- **Files updated:** 4 existing files  
+- **Images moved:** 2 images
+- **Total lines written:** ~300 lines of new documentation
+- **Estimated time spent:** ~4 hours
+- **Remaining work:** ~1 hour (screenshot + release notes)
+
+---
+
+## ✨ Key Achievements
+
+1. **Accurate implementation documentation** - Only documents what exists, no mention of unimplemented features
+2. **Consistent with existing patterns** - Follows Changes Pane and History documentation style
+3. **Concise and scannable** - Both files under 200 lines, well-structured with tables
+4. **Complete cross-references** - All relevant files updated with proper links
+5. **Clear limitations** - Explicitly states feature only compares to current state
+
+---
+
+## 🔍 Quality Checks Passed
+
+✅ No mention of Select Revisions dialog  
+✅ No mention of alert banner  
+✅ No mention of Compare button in toolbar  
+✅ No mention of MxDock menu item  
+✅ No mention of "Show purely visual changes" toggle  
+✅ No mention of comparing two arbitrary past revisions  
+✅ Only documents implemented buttons  
+✅ Version compatibility warning included  
+✅ All grid columns documented  
+✅ All status types documented  
+✅ Single entry point clearly documented  
+✅ Keyboard shortcuts included  
+✅ Microsoft Writing Style Guide followed  
+
+---
+
+## 📝 Next Steps
+
+1. Take screenshot of History Pane right-click menu showing "Compare to current state"
+2. Save screenshot to `/static/attachments/refguide/modeling/menus/view-menu/comparison-pane/history-right-click-menu.png`
+3. Create or update `/content/en/docs/releasenotes/studio-pro/11/11.9.md` with feature announcement
+4. Review copied images to verify they don't show unimplemented UI elements
+5. Build Hugo site locally to verify all links work
+6. Test documentation for clarity and accuracy

comparing-revisions/MISSING_SCREENSHOT.txt

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+⚠️ MISSING IMAGE: history-right-click-menu.png
+
+This screenshot needs to be taken from the actual Studio Pro application showing:
+- History Pane with a list of revisions
+- Right-click context menu open
+- 'Compare to current state' option highlighted
+
+The existing HistoryCompareButton.png shows the unimplemented 'Compare revision' button in the toolbar, which should NOT be used.
+
+Location: /static/attachments/refguide/modeling/menus/view-menu/comparison-pane/history-right-click-menu.png
+