Fix: bug in JXTreeTable.getEditingRow

[tonygermano]

org.jdesktop.swingx.JXTreeTable contains the following (decompiled) methods

public boolean isHierarchical(int column) {
   if (column >= 0 && column < this.getColumnCount()) {
      return this.getHierarchicalColumn() == column;
   } else {
      throw new IllegalArgumentException("column must be valid, was" + column);
   }
}

public int getEditingRow() {
   if (this.editingRow == -1) {
      return -1;
   } else {
      return this.isHierarchical(this.editingColumn) ? -1 : this.editingRow;
   }
}

Exceptions are thrown, especially on macOS clients, when getEditingRow is called while not editing, causing isHeirarchical to be called when editingColumn is -1.

This commit overrides getEditingRow to protect against that condition.

Fixes #272

Several issues with similar stack traces have been logged against Mirth and Bridgelink over the past few years.

[github-actions]

Test Results

  111 files  ±0    214 suites  ±0   7m 1s ⏱️ + 1m 9s
  654 tests ±0    654 ✅ ±0  0 💤 ±0  0 ❌ ±0 
1 308 runs  ±0  1 308 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit be058f6. ± Comparison against base commit be1072d.

♻️ This comment has been updated with latest results.