IDEA-53596 Soft wrap for editors

Corrected 'Home' key typing processing in order to move to the first non-white space symbol on a line if caret is not positioned at the first column

platform/platform-api/src/com/intellij/openapi/editor/LogicalPosition.java

@@ -26,6 +26,9 @@ import org.jetbrains.annotations.NonNls;
  * single logical <code>(line; column)</code> pair matches soft wrap-introduced virtual space, i.e. different visual positions
  * correspond to the same logical position. It's convenient to store exact visual location details within the logical
  * position in order to relief further {@code 'logical position' -> 'visual position'} mapping.
+ * <p/>
+ * <b>Note:</b> two objects of this class are considered equal if their logical line and column are equal. I.e. all logical positions
+ * for soft wrap-introduced virtual space and the first document symbol after soft wrap are considered to be equal.
  *
  * @see Editor#offsetToLogicalPosition(int)
  * @see Editor#logicalPositionToOffset(LogicalPosition)
@@ -134,18 +137,11 @@ public class LogicalPosition implements Comparable<LogicalPosition> {
     if (!(o instanceof LogicalPosition)) return false;
     final LogicalPosition logicalPosition = (LogicalPosition) o;
 
-    return column == logicalPosition.column && line == logicalPosition.line && softWrapLines == logicalPosition.softWrapLines
-           && linesFromActiveSoftWrap == logicalPosition.linesFromActiveSoftWrap
-           && softWrapColumnDiff == logicalPosition.softWrapColumnDiff && foldedLines == logicalPosition.foldedLines
-           && foldingColumnDiff == logicalPosition.foldingColumnDiff;
+    return column == logicalPosition.column && line == logicalPosition.line;
   }
 
   public int hashCode() {
-    int result = 29 * line + column;
-    result = result * 29 + softWrapLines;
-    result = 29 * result + softWrapColumnDiff;
-    result = 29 * result + foldedLines;
-    return 29 * result + foldingColumnDiff;
+    return 29 * line + column;
   }
 
   @NonNls

platform/platform-impl/src/com/intellij/openapi/editor/actions/EditorActionUtil.java

@@ -233,10 +233,13 @@ public class EditorActionUtil {
     }
     else if (logLineToUse == logCaretLine) {
       int line = currentVisCaret.line;
-      int column = 0;
+      int column;
       if (currentVisCaret.column == 0) {
         column = findSmartIndentColumn(editor, currentVisCaret.line);
       }
+      else {
+        column = findFirstNonSpaceColumnOnTheLine(editor, currentVisCaret.line);
+      }
       caretModel.moveToVisualPosition(new VisualPosition(line, column));
     }
     else {

platform/platform-impl/src/com/intellij/openapi/editor/impl/SoftWrapModelImpl.java

@@ -279,7 +279,7 @@ public class SoftWrapModelImpl implements SoftWrapModelEx {
 
   @NotNull
   public LogicalPosition adjustLogicalPosition(@NotNull LogicalPosition defaultLogical, @NotNull VisualPosition visual) {
-    if (myActive > 0 || !isSoftWrappingEnabled() || myWraps.isEmpty()) {
+    if (myActive > 0 || !isSoftWrappingEnabled() || myWraps.isEmpty() || myEditor.getDocument().getTextLength() <= 0) {
       return defaultLogical;
     }