Fix search replace processor to correctly handle trailing whitespace

- add a test case that wil prove the change  sucessful [Changes]

└── apps
    └── editor
        └── src
            └── utils
                └── changes-integration
                    └── search-replace-processor
                        └── apply-search-replace-to-content
                            ├── apply-search-replace-to-content.spec.ts
                            ├── apply-search-replace-to-content.ts
                            └── test-cases
                                ├── basic-conflict
                                │   ├── expected.txt
                                │   ├── markers.txt
                                │   └── original.txt
                                ├── deletion
                                │   ├── expected.txt
                                │   ├── markers.txt
                                │   └── original.txt
                                ├── multiple-conflicts
                                │   ├── expected.txt
                                │   ├── markers.txt
                                │   └── original.txt
                                ├── rst-syntax
                                │   ├── expected.txt
                                │   ├── markers.txt
                                │   └── original.txt
                                ├── trailing-whitespace
                                │   ├── expected.txt
                                │   ├── markers.txt
                                │   └── original.txt
                                └── whitespace-issues
                                    ├── expected.txt
                                    ├── markers.txt
                                    └── original.txt

Author: robertpiosik

apps/editor/src/utils/changes-integration/search-replace-processor/apply-search-replace-to-content/apply-search-replace-to-content.spec.ts

@@ -55,6 +55,10 @@ describe('search-replace-parser', () => {
       run_test_case('whitespace-issues')
     })
 
+    it('handles trailing whitespace correctly without deleting it', () => {
+      run_test_case('trailing-whitespace')
+    })
+
     it('handles rst syntax correctly', () => {
       run_test_case('rst-syntax')
     })

apps/editor/src/utils/changes-integration/search-replace-processor/apply-search-replace-to-content/apply-search-replace-to-content.ts

@@ -36,14 +36,14 @@ export const apply_search_replace_to_content = (params: {
     const clean_original = clean_lines(segment.original_lines)
     const clean_context_after = clean_lines(context_after)
 
-    const SEPARATOR = '(?:\\r?\\n[ \\t]*){1,5}'
+    const SEPARATOR = '(?:[ \\t]*\\r?\\n){1,5}'
 
     const build_block_pattern = (lines: string[]) => {
       return lines
         .map((line) => {
           const trimmed = line.trim()
           const escaped = escape_reg_exp(trimmed)
-          return `[ \\t]*${escaped}[ \\t]*`
+          return `[ \\t]*${escaped}`
         })
         .join(SEPARATOR)
     }

apps/editor/src/utils/changes-integration/search-replace-processor/apply-search-replace-to-content/test-cases/trailing-whitespace/expected.txt

@@ -0,0 +1,3 @@
+line 1
+line 2 updated
+line 3

apps/editor/src/utils/changes-integration/search-replace-processor/apply-search-replace-to-content/test-cases/trailing-whitespace/markers.txt

@@ -0,0 +1,7 @@
+line 1
+<<<<<<<
+line 2
+=======
+line 2 updated
+>>>>>>>
+line 3

apps/editor/src/utils/changes-integration/search-replace-processor/apply-search-replace-to-content/test-cases/trailing-whitespace/original.txt

@@ -0,0 +1,5 @@
+line 1   
+  
+line 2	
+	
+line 3