Add "Canvas" crop mode.

Canvas will change the size of the canvas without cropping any layers.
BUG: 393113

plugins/tools/tool_crop/kis_tool_crop.cc

@@ -215,7 +215,9 @@ void KisToolCrop::canvasResourceChanged(int key, const QVariant &res)
     }
     //vector layer
     else {
-        setCropType(ImageCropType);
+        if (m_cropType != ImageCropType || m_cropType != CanvasCropType) {
+            setCropType(ImageCropType);
+        }
         setCropTypeSelectable(false);
     }
 }
@@ -450,7 +452,7 @@ void KisToolCrop::crop()
     KIS_ASSERT_RECOVER_RETURN(currentImage());
     if (m_finalRect.rect().isEmpty()) return;
 
-    const bool imageCrop = m_cropType == ImageCropType;
+    const bool imageCrop = m_cropType == ImageCropType || m_cropType == CanvasCropType;
 
     if (!imageCrop) {
         //Cropping layer
@@ -466,7 +468,11 @@ void KisToolCrop::crop()
 
     // The visitor adds the undo steps to the macro
     if (imageCrop || !currentNode()->paintDevice()) {
-        currentImage()->cropImage(cropRect);
+        if (m_cropType == CanvasCropType) {
+            currentImage()->resizeImage(cropRect);
+        } else {
+            currentImage()->cropImage(cropRect);
+        }
     } else {
         currentImage()->cropNode(currentNode(), cropRect, m_cropType == FrameCropType);
     }

plugins/tools/tool_crop/kis_tool_crop.h

@@ -53,6 +53,7 @@ class KisToolCrop : public KisTool
 public:
     enum CropToolType {
         ImageCropType,
+        CanvasCropType,
         LayerCropType,
         FrameCropType
     };

plugins/tools/tool_crop/kistoolcropconfigwidget.cpp

@@ -9,6 +9,7 @@
 #include "kis_tool_crop.h"
 #include <kis_icon.h>
 #include <kis_acyclic_signal_connector.h>
+#include <QStandardItemModel>
 
 
 KisToolCropConfigWidget::KisToolCropConfigWidget(QWidget* parent, KisToolCrop* cropTool)
@@ -18,9 +19,14 @@ KisToolCropConfigWidget::KisToolCropConfigWidget(QWidget* parent, KisToolCrop* c
     setupUi(this);
 
     // update the UI based off data from crop tool
-    intHeight->setValue(m_cropTool->cropHeight());
     cmbType->setCurrentIndex(m_cropTool->cropType());
-    cmbType->setEnabled(m_cropTool->cropTypeSelectable());
+    QStandardItemModel *cmbTypeModel = qobject_cast<QStandardItemModel *>(cmbType->model());
+    // Disable "Layer"
+    cmbTypeModel->item(2)->setEnabled(m_cropTool->cropTypeSelectable());
+    // Disable "Frame"
+    cmbTypeModel->item(3)->setEnabled(m_cropTool->cropTypeSelectable());
+
+    intHeight->setValue(m_cropTool->cropHeight());
     intWidth->setValue(m_cropTool->cropWidth());
     intX->setValue(m_cropTool->cropX());
     intY->setValue(m_cropTool->cropY());
@@ -100,7 +106,11 @@ KisToolCropConfigWidget::KisToolCropConfigWidget(QWidget* parent, KisToolCrop* c
 
 void KisToolCropConfigWidget::cropTypeSelectableChanged()
 {
-    cmbType->setEnabled(m_cropTool->cropTypeSelectable());
+    QStandardItemModel *cmbTypeModel = qobject_cast<QStandardItemModel *>(cmbType->model());
+    // Disable "Layer"
+    cmbTypeModel->item(2)->setEnabled(m_cropTool->cropTypeSelectable());
+    // Disable "Frame"
+    cmbTypeModel->item(3)->setEnabled(m_cropTool->cropTypeSelectable());
 }
 
 void KisToolCropConfigWidget::updateLockRatioIcon()

plugins/tools/tool_crop/wdg_tool_crop.ui

@@ -400,6 +400,11 @@
          <string>Image</string>
         </property>
        </item>
+       <item>
+        <property name="text">
+         <string>Canvas</string>
+        </property>
+       </item>
        <item>
         <property name="text">
          <string>Layer</string>